<?xml version="1.0" encoding="us-ascii"?>
<!--Generated by Thomson Reuters Accelus-->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:t1="http://xbrl.org/2005/xbrldt">
  <link:roleRef roleURI="http://lufkin.com/role/SegmentDataDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#SegmentDataDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/UncertainTaxPositionsDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#UncertainTaxPositionsDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/StockCompensationPlansDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#StockCompensationPlansDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/NetEarningsPerShareDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#NetEarningsPerShareDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/ComprehensiveIncomeDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#ComprehensiveIncomeDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/LegalProceedingsDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#LegalProceedingsDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/RetirementBenefitsDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#RetirementBenefitsDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/DebtObligationsDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#DebtObligationsDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/OtherCurrentAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#OtherCurrentAccruedLiabilitiesDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/GoodwillAndIntangibleAssetsDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#GoodwillAndIntangibleAssetsDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/PropertyPlantEquipmentDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#PropertyPlantEquipmentDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/InventoriesDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#InventoriesDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/ReceivablesDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#ReceivablesDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/AcquisitionsDetails" xlink:type="simple" xlink:href="lufk-20120331.xsd#AcquisitionsDetails" />
  <link:roleRef roleURI="http://lufkin.com/role/SegmentDataTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#SegmentDataTables" />
  <link:roleRef roleURI="http://lufkin.com/role/UncertainTaxPositionsTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#UncertainTaxPositionsTables" />
  <link:roleRef roleURI="http://lufkin.com/role/StockCompensationPlansTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#StockCompensationPlansTables" />
  <link:roleRef roleURI="http://lufkin.com/role/NetEarningsPerShareTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#NetEarningsPerShareTables" />
  <link:roleRef roleURI="http://lufkin.com/role/ComprehensiveIncomeTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#ComprehensiveIncomeTables" />
  <link:roleRef roleURI="http://lufkin.com/role/RetirementBenefitsTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#RetirementBenefitsTables" />
  <link:roleRef roleURI="http://lufkin.com/role/DebtObligationsTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#DebtObligationsTables" />
  <link:roleRef roleURI="http://lufkin.com/role/OtherCurrentAccruedLiabilitiesTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#OtherCurrentAccruedLiabilitiesTables" />
  <link:roleRef roleURI="http://lufkin.com/role/GoodwillAndIntangibleAssetsTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#GoodwillAndIntangibleAssetsTables" />
  <link:roleRef roleURI="http://lufkin.com/role/PropertyPlantEquipmentTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#PropertyPlantEquipmentTables" />
  <link:roleRef roleURI="http://lufkin.com/role/InventoriesTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#InventoriesTables" />
  <link:roleRef roleURI="http://lufkin.com/role/ReceivablesTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#ReceivablesTables" />
  <link:roleRef roleURI="http://lufkin.com/role/AcquisitionsTables" xlink:type="simple" xlink:href="lufk-20120331.xsd#AcquisitionsTables" />
  <link:roleRef roleURI="http://lufkin.com/role/SegmentData" xlink:type="simple" xlink:href="lufk-20120331.xsd#SegmentData" />
  <link:roleRef roleURI="http://lufkin.com/role/UncertainTaxPositions" xlink:type="simple" xlink:href="lufk-20120331.xsd#UncertainTaxPositions" />
  <link:roleRef roleURI="http://lufkin.com/role/StockCompensationPlans" xlink:type="simple" xlink:href="lufk-20120331.xsd#StockCompensationPlans" />
  <link:roleRef roleURI="http://lufkin.com/role/NetEarningsPerShare" xlink:type="simple" xlink:href="lufk-20120331.xsd#NetEarningsPerShare" />
  <link:roleRef roleURI="http://lufkin.com/role/ComprehensiveIncome" xlink:type="simple" xlink:href="lufk-20120331.xsd#ComprehensiveIncome" />
  <link:roleRef roleURI="http://lufkin.com/role/LegalProceedings" xlink:type="simple" xlink:href="lufk-20120331.xsd#LegalProceedings" />
  <link:roleRef roleURI="http://lufkin.com/role/RetirementBenefits" xlink:type="simple" xlink:href="lufk-20120331.xsd#RetirementBenefits" />
  <link:roleRef roleURI="http://lufkin.com/role/Debt" xlink:type="simple" xlink:href="lufk-20120331.xsd#Debt" />
  <link:roleRef roleURI="http://lufkin.com/role/OtherCurrentAccruedLiabilities" xlink:type="simple" xlink:href="lufk-20120331.xsd#OtherCurrentAccruedLiabilities" />
  <link:roleRef roleURI="http://lufkin.com/role/GoodwillAndIntangibleAssets" xlink:type="simple" xlink:href="lufk-20120331.xsd#GoodwillAndIntangibleAssets" />
  <link:roleRef roleURI="http://lufkin.com/role/PropertyPlantEquipment" xlink:type="simple" xlink:href="lufk-20120331.xsd#PropertyPlantEquipment" />
  <link:roleRef roleURI="http://lufkin.com/role/Inventories" xlink:type="simple" xlink:href="lufk-20120331.xsd#Inventories" />
  <link:roleRef roleURI="http://lufkin.com/role/Receivables" xlink:type="simple" xlink:href="lufk-20120331.xsd#Receivables" />
  <link:roleRef roleURI="http://lufkin.com/role/Acquisitions" xlink:type="simple" xlink:href="lufk-20120331.xsd#Acquisitions" />
  <link:roleRef roleURI="http://lufkin.com/role/RecentlyIssuedAccountingPronouncements" xlink:type="simple" xlink:href="lufk-20120331.xsd#RecentlyIssuedAccountingPronouncements" />
  <link:roleRef roleURI="http://lufkin.com/role/BasisOfPresentation" xlink:type="simple" xlink:href="lufk-20120331.xsd#BasisOfPresentation" />
  <link:roleRef roleURI="http://lufkin.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="simple" xlink:href="lufk-20120331.xsd#CondensedConsolidatedStatementsOfCashFlowsUnaudited" />
  <link:roleRef roleURI="http://lufkin.com/role/StatementOfConsolidatedComprehensiveIncomeUnaudited" xlink:type="simple" xlink:href="lufk-20120331.xsd#StatementOfConsolidatedComprehensiveIncomeUnaudited" />
  <link:roleRef roleURI="http://lufkin.com/role/CondensedConsolidatedStatementsOfEarningsUnaudited" xlink:type="simple" xlink:href="lufk-20120331.xsd#CondensedConsolidatedStatementsOfEarningsUnaudited" />
  <link:roleRef roleURI="http://lufkin.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" xlink:href="lufk-20120331.xsd#CondensedConsolidatedBalanceSheetsUnauditedParenthetical" />
  <link:roleRef roleURI="http://lufkin.com/role/CondensedConsolidatedBalanceSheetsUnaudited" xlink:type="simple" xlink:href="lufk-20120331.xsd#CondensedConsolidatedBalanceSheetsUnaudited" />
  <link:roleRef roleURI="http://lufkin.com/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="lufk-20120331.xsd#DocumentAndEntityInformation" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/DocumentAndEntityInformation" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/CondensedConsolidatedBalanceSheetsUnaudited" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/CondensedConsolidatedStatementsOfEarningsUnaudited" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/StatementOfConsolidatedComprehensiveIncomeUnaudited" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/BasisOfPresentation" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/RecentlyIssuedAccountingPronouncements" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/Acquisitions" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/Receivables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/Inventories" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/PropertyPlantEquipment" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/GoodwillAndIntangibleAssets" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/OtherCurrentAccruedLiabilities" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/Debt" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/RetirementBenefits" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/LegalProceedings" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/ComprehensiveIncome" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/NetEarningsPerShare" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/StockCompensationPlans" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/UncertainTaxPositions" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/SegmentData" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/AcquisitionsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/ReceivablesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/InventoriesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/PropertyPlantEquipmentTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/GoodwillAndIntangibleAssetsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/OtherCurrentAccruedLiabilitiesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/DebtObligationsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/RetirementBenefitsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/ComprehensiveIncomeTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/NetEarningsPerShareTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/StockCompensationPlansTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/UncertainTaxPositionsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/SegmentDataTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/AcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="BusinessAcquisitionLineItems" xlink:title="BusinessAcquisitionLineItems" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_BusinessAcquisitionDateOfPurchase" xlink:label="BusinessAcquisitionDateOfPurchase" xlink:title="BusinessAcquisitionDateOfPurchase" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionDateOfPurchase" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionDateOfPurchase" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_TermOfRoyaltyAgreement" xlink:label="TermOfRoyaltyAgreement" xlink:title="TermOfRoyaltyAgreement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="TermOfRoyaltyAgreement" xlink:title="definition: BusinessAcquisitionLineItems to TermOfRoyaltyAgreement" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_RoyaltyRate" xlink:label="RoyaltyRate" xlink:title="RoyaltyRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="RoyaltyRate" xlink:title="definition: BusinessAcquisitionLineItems to RoyaltyRate" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:title="BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_BusinessAcquisitionEquityInterestsIssuedFairValuePerShare" xlink:label="BusinessAcquisitionEquityInterestsIssuedFairValuePerShare" xlink:title="BusinessAcquisitionEquityInterestsIssuedFairValuePerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionEquityInterestsIssuedFairValuePerShare" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionEquityInterestsIssuedFairValuePerShare" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:label="BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:title="BusinessAcquisitionCostOfAcquiredEntityCashPaid" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionCostOfAcquiredEntityCashPaid" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration" xlink:label="BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration" xlink:title="BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable" xlink:label="BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable" xlink:title="BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" xlink:label="BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" xlink:title="BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" xlink:label="BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" xlink:title="BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_BusinessAcquisitionPurchasePriceAllocationNonCompeteAgreementsAndTrademarks" xlink:label="BusinessAcquisitionPurchasePriceAllocationNonCompeteAgreementsAndTrademarks" xlink:title="BusinessAcquisitionPurchasePriceAllocationNonCompeteAgreementsAndTrademarks" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationNonCompeteAgreementsAndTrademarks" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationNonCompeteAgreementsAndTrademarks" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" xlink:label="BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" xlink:title="BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets" xlink:label="BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets" xlink:title="BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_BusinessAcquisitionPurchasePriceAllocationIndemnificationAsset" xlink:label="BusinessAcquisitionPurchasePriceAllocationIndemnificationAsset" xlink:title="BusinessAcquisitionPurchasePriceAllocationIndemnificationAsset" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationIndemnificationAsset" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationIndemnificationAsset" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" order="18.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" order="19.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_BusinessAcquisitionPurchasePriceAllocationIndemnificationLiability" xlink:label="BusinessAcquisitionPurchasePriceAllocationIndemnificationLiability" xlink:title="BusinessAcquisitionPurchasePriceAllocationIndemnificationLiability" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationIndemnificationLiability" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationIndemnificationLiability" order="20.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:label="BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:title="BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" order="21.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationAbstract" xlink:label="BusinessAcquisitionProFormaInformationAbstract" xlink:title="BusinessAcquisitionProFormaInformationAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionProFormaInformationAbstract" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionProFormaInformationAbstract" order="22.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="BusinessAcquisitionsProFormaRevenue" xlink:title="BusinessAcquisitionsProFormaRevenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionsProFormaRevenue" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionsProFormaRevenue" order="23.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="BusinessAcquisitionsProFormaNetIncomeLoss" xlink:title="BusinessAcquisitionsProFormaNetIncomeLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionsProFormaNetIncomeLoss" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionsProFormaNetIncomeLoss" order="24.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:label="BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:title="BusinessAcquisitionProFormaEarningsPerShareDiluted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionProFormaEarningsPerShareDiluted" order="25.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:title="ScheduleOfBusinessAcquisitionsByAcquisitionTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="BusinessAcquisitionLineItems" xlink:to="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:title="definition: BusinessAcquisitionLineItems to ScheduleOfBusinessAcquisitionsByAcquisitionTable" order="26.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="BusinessAcquisitionAxis" xlink:title="BusinessAcquisitionAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="BusinessAcquisitionAxis" xlink:title="definition: ScheduleOfBusinessAcquisitionsByAcquisitionTable to BusinessAcquisitionAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="BusinessAcquisitionAcquireeDomain" xlink:title="BusinessAcquisitionAcquireeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BusinessAcquisitionAxis" xlink:to="BusinessAcquisitionAcquireeDomain" xlink:title="definition: BusinessAcquisitionAxis to BusinessAcquisitionAcquireeDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="BusinessAcquisitionAcquireeDomain_2" xlink:title="BusinessAcquisitionAcquireeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BusinessAcquisitionAxis" xlink:to="BusinessAcquisitionAcquireeDomain_2" xlink:title="definition: BusinessAcquisitionAxis to BusinessAcquisitionAcquireeDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_PentagonOptimizationServicesMember" xlink:label="PentagonOptimizationServicesMember" xlink:title="PentagonOptimizationServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="PentagonOptimizationServicesMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to PentagonOptimizationServicesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_QuinnsOilfieldSupplyLtdMember" xlink:label="QuinnsOilfieldSupplyLtdMember" xlink:title="QuinnsOilfieldSupplyLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="QuinnsOilfieldSupplyLtdMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to QuinnsOilfieldSupplyLtdMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_DatacInstrumentationLimitedMember" xlink:label="DatacInstrumentationLimitedMember" xlink:title="DatacInstrumentationLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="DatacInstrumentationLimitedMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to DatacInstrumentationLimitedMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_ZenithOilfieldTechnologyLtdMember" xlink:label="ZenithOilfieldTechnologyLtdMember" xlink:title="ZenithOilfieldTechnologyLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="ZenithOilfieldTechnologyLtdMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to ZenithOilfieldTechnologyLtdMember" order="4.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/ReceivablesDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="AccountsNotesAndLoansReceivableLineItems" xlink:title="AccountsNotesAndLoansReceivableLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="AccountsReceivableGrossCurrent" xlink:title="AccountsReceivableGrossCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccountsNotesAndLoansReceivableLineItems" xlink:to="AccountsReceivableGrossCurrent" xlink:title="definition: AccountsNotesAndLoansReceivableLineItems to AccountsReceivableGrossCurrent" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="AllowanceForDoubtfulAccountsReceivableCurrent" xlink:title="AllowanceForDoubtfulAccountsReceivableCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccountsNotesAndLoansReceivableLineItems" xlink:to="AllowanceForDoubtfulAccountsReceivableCurrent" xlink:title="definition: AccountsNotesAndLoansReceivableLineItems to AllowanceForDoubtfulAccountsReceivableCurrent" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="AccountsReceivableNetCurrent" xlink:title="AccountsReceivableNetCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccountsNotesAndLoansReceivableLineItems" xlink:to="AccountsReceivableNetCurrent" xlink:title="definition: AccountsNotesAndLoansReceivableLineItems to AccountsReceivableNetCurrent" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:title="ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="AccountsNotesAndLoansReceivableLineItems" xlink:to="ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:title="definition: AccountsNotesAndLoansReceivableLineItems to ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" order="4.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:title="AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:to="AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:title="definition: ScheduleOfAccountsNotesLoansAndFinancingReceivableTable to AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="ReceivableTypeDomain" xlink:title="ReceivableTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:to="ReceivableTypeDomain" xlink:title="definition: AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis to ReceivableTypeDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="ReceivableTypeDomain_2" xlink:title="ReceivableTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:to="ReceivableTypeDomain_2" xlink:title="definition: AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis to ReceivableTypeDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TradeAccountsReceivableMember" xlink:label="TradeAccountsReceivableMember" xlink:title="TradeAccountsReceivableMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ReceivableTypeDomain" xlink:to="TradeAccountsReceivableMember" xlink:title="definition: ReceivableTypeDomain to TradeAccountsReceivableMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NotesReceivableMember" xlink:label="NotesReceivableMember" xlink:title="NotesReceivableMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ReceivableTypeDomain" xlink:to="NotesReceivableMember" xlink:title="definition: ReceivableTypeDomain to NotesReceivableMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_OtherReceivablesMember" xlink:label="OtherReceivablesMember" xlink:title="OtherReceivablesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ReceivableTypeDomain" xlink:to="OtherReceivablesMember" xlink:title="definition: ReceivableTypeDomain to OtherReceivablesMember" order="3.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/InventoriesDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/PropertyPlantEquipmentDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="PropertyPlantAndEquipmentLineItems" xlink:title="PropertyPlantAndEquipmentLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="PropertyPlantAndEquipmentGross" xlink:title="PropertyPlantAndEquipmentGross" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentLineItems" xlink:to="PropertyPlantAndEquipmentGross" xlink:title="definition: PropertyPlantAndEquipmentLineItems to PropertyPlantAndEquipmentGross" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:title="AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentLineItems" xlink:to="AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:title="definition: PropertyPlantAndEquipmentLineItems to AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="PropertyPlantAndEquipmentNet" xlink:title="PropertyPlantAndEquipmentNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentLineItems" xlink:to="PropertyPlantAndEquipmentNet" xlink:title="definition: PropertyPlantAndEquipmentLineItems to PropertyPlantAndEquipmentNet" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Depreciation" xlink:label="Depreciation" xlink:title="Depreciation" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentLineItems" xlink:to="Depreciation" xlink:title="definition: PropertyPlantAndEquipmentLineItems to Depreciation" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="ScheduleOfPropertyPlantAndEquipmentTable" xlink:title="ScheduleOfPropertyPlantAndEquipmentTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="PropertyPlantAndEquipmentLineItems" xlink:to="ScheduleOfPropertyPlantAndEquipmentTable" xlink:title="definition: PropertyPlantAndEquipmentLineItems to ScheduleOfPropertyPlantAndEquipmentTable" order="5.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="PropertyPlantAndEquipmentByTypeAxis" xlink:title="PropertyPlantAndEquipmentByTypeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfPropertyPlantAndEquipmentTable" xlink:to="PropertyPlantAndEquipmentByTypeAxis" xlink:title="definition: ScheduleOfPropertyPlantAndEquipmentTable to PropertyPlantAndEquipmentByTypeAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="PropertyPlantAndEquipmentTypeDomain" xlink:title="PropertyPlantAndEquipmentTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="PropertyPlantAndEquipmentByTypeAxis" xlink:to="PropertyPlantAndEquipmentTypeDomain" xlink:title="definition: PropertyPlantAndEquipmentByTypeAxis to PropertyPlantAndEquipmentTypeDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="PropertyPlantAndEquipmentTypeDomain_2" xlink:title="PropertyPlantAndEquipmentTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="PropertyPlantAndEquipmentByTypeAxis" xlink:to="PropertyPlantAndEquipmentTypeDomain_2" xlink:title="definition: PropertyPlantAndEquipmentByTypeAxis to PropertyPlantAndEquipmentTypeDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LandMember" xlink:label="LandMember" xlink:title="LandMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentTypeDomain" xlink:to="LandMember" xlink:title="definition: PropertyPlantAndEquipmentTypeDomain to LandMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LandImprovementsMember" xlink:label="LandImprovementsMember" xlink:title="LandImprovementsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentTypeDomain" xlink:to="LandImprovementsMember" xlink:title="definition: PropertyPlantAndEquipmentTypeDomain to LandImprovementsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BuildingMember" xlink:label="BuildingMember" xlink:title="BuildingMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentTypeDomain" xlink:to="BuildingMember" xlink:title="definition: PropertyPlantAndEquipmentTypeDomain to BuildingMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="MachineryAndEquipmentMember" xlink:title="MachineryAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentTypeDomain" xlink:to="MachineryAndEquipmentMember" xlink:title="definition: PropertyPlantAndEquipmentTypeDomain to MachineryAndEquipmentMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="FurnitureAndFixturesMember" xlink:title="FurnitureAndFixturesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentTypeDomain" xlink:to="FurnitureAndFixturesMember" xlink:title="definition: PropertyPlantAndEquipmentTypeDomain to FurnitureAndFixturesMember" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_ComputerEquipmentAndSoftwareMember" xlink:label="ComputerEquipmentAndSoftwareMember" xlink:title="ComputerEquipmentAndSoftwareMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentTypeDomain" xlink:to="ComputerEquipmentAndSoftwareMember" xlink:title="definition: PropertyPlantAndEquipmentTypeDomain to ComputerEquipmentAndSoftwareMember" order="6.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/GoodwillAndIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:title="AcquiredFiniteLivedIntangibleAssetsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAbstract" xlink:label="FiniteLivedIntangibleAssetsAbstract" xlink:title="FiniteLivedIntangibleAssetsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:to="FiniteLivedIntangibleAssetsAbstract" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsLineItems to FiniteLivedIntangibleAssetsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpense" xlink:label="FiniteLivedIntangibleAssetsAmortizationExpense" xlink:title="FiniteLivedIntangibleAssetsAmortizationExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:to="FiniteLivedIntangibleAssetsAmortizationExpense" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsLineItems to FiniteLivedIntangibleAssetsAmortizationExpense" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="FiniteLivedIntangibleAssetsGross" xlink:title="FiniteLivedIntangibleAssetsGross" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:to="FiniteLivedIntangibleAssetsGross" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsLineItems to FiniteLivedIntangibleAssetsGross" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:title="FiniteLivedIntangibleAssetsAccumulatedAmortization" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:to="FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsLineItems to FiniteLivedIntangibleAssetsAccumulatedAmortization" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="FiniteLivedIntangibleAssetsNet" xlink:title="FiniteLivedIntangibleAssetsNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:to="FiniteLivedIntangibleAssetsNet" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsLineItems to FiniteLivedIntangibleAssetsNet" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:title="FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:to="FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsLineItems to FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:label="ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:title="ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:to="ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsLineItems to ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" order="7.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:title="AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:to="AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:title="definition: ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable to AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:title="FiniteLivedIntangibleAssetsMajorClassNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis to FiniteLivedIntangibleAssetsMajorClassNameDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="FiniteLivedIntangibleAssetsMajorClassNameDomain_2" xlink:title="FiniteLivedIntangibleAssetsMajorClassNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="FiniteLivedIntangibleAssetsMajorClassNameDomain_2" xlink:title="definition: AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis to FiniteLivedIntangibleAssetsMajorClassNameDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_NonCompeteAgreementsAndTrademarksMember" xlink:label="NonCompeteAgreementsAndTrademarksMember" xlink:title="NonCompeteAgreementsAndTrademarksMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="NonCompeteAgreementsAndTrademarksMember" xlink:title="definition: FiniteLivedIntangibleAssetsMajorClassNameDomain to NonCompeteAgreementsAndTrademarksMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_CustomerRelationshipsAndContractsMember" xlink:label="CustomerRelationshipsAndContractsMember" xlink:title="CustomerRelationshipsAndContractsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="CustomerRelationshipsAndContractsMember" xlink:title="definition: FiniteLivedIntangibleAssetsMajorClassNameDomain to CustomerRelationshipsAndContractsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="GoodwillLineItems" xlink:title="GoodwillLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="GoodwillRollForward" xlink:title="GoodwillRollForward" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GoodwillLineItems" xlink:to="GoodwillRollForward" xlink:title="definition: GoodwillLineItems to GoodwillRollForward" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Goodwill" xlink:label="Goodwill" xlink:title="Goodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GoodwillLineItems" xlink:to="Goodwill" xlink:title="definition: GoodwillLineItems to Goodwill" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="GoodwillAcquiredDuringPeriod" xlink:title="GoodwillAcquiredDuringPeriod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GoodwillLineItems" xlink:to="GoodwillAcquiredDuringPeriod" xlink:title="definition: GoodwillLineItems to GoodwillAcquiredDuringPeriod" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillTranslationAdjustments" xlink:label="GoodwillTranslationAdjustments" xlink:title="GoodwillTranslationAdjustments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GoodwillLineItems" xlink:to="GoodwillTranslationAdjustments" xlink:title="definition: GoodwillLineItems to GoodwillTranslationAdjustments" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="ScheduleOfGoodwillTable" xlink:title="ScheduleOfGoodwillTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="GoodwillLineItems" xlink:to="ScheduleOfGoodwillTable" xlink:title="definition: GoodwillLineItems to ScheduleOfGoodwillTable" order="5.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="StatementBusinessSegmentsAxis" xlink:title="StatementBusinessSegmentsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfGoodwillTable" xlink:to="StatementBusinessSegmentsAxis" xlink:title="definition: ScheduleOfGoodwillTable to StatementBusinessSegmentsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentDomain" xlink:label="SegmentDomain" xlink:title="SegmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementBusinessSegmentsAxis" xlink:to="SegmentDomain" xlink:title="definition: StatementBusinessSegmentsAxis to SegmentDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentDomain" xlink:label="SegmentDomain_2" xlink:title="SegmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementBusinessSegmentsAxis" xlink:to="SegmentDomain_2" xlink:title="definition: StatementBusinessSegmentsAxis to SegmentDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_OilFieldMember" xlink:label="OilFieldMember" xlink:title="OilFieldMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentDomain" xlink:to="OilFieldMember" xlink:title="definition: SegmentDomain to OilFieldMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_PowerTransmissionMember" xlink:label="PowerTransmissionMember" xlink:title="PowerTransmissionMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentDomain" xlink:to="PowerTransmissionMember" xlink:title="definition: SegmentDomain to PowerTransmissionMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/OtherCurrentAccruedLiabilitiesDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/DebtObligationsDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/RetirementBenefitsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="DefinedBenefitPlanDisclosureLineItems" xlink:title="DefinedBenefitPlanDisclosureLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="DefinedBenefitPlanServiceCost" xlink:title="DefinedBenefitPlanServiceCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanServiceCost" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanServiceCost" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="DefinedBenefitPlanInterestCost" xlink:title="DefinedBenefitPlanInterestCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanInterestCost" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanInterestCost" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:title="DefinedBenefitPlanExpectedReturnOnPlanAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanExpectedReturnOnPlanAssets" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:title="DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" xlink:label="DefinedBenefitPlanAmortizationOfGainsLosses" xlink:title="DefinedBenefitPlanAmortizationOfGainsLosses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanAmortizationOfGainsLosses" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanAmortizationOfGainsLosses" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="DefinedBenefitPlanNetPeriodicBenefitCost" xlink:title="DefinedBenefitPlanNetPeriodicBenefitCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanNetPeriodicBenefitCost" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanNetPeriodicBenefitCost" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearLowerRange" xlink:label="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearLowerRange" xlink:title="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearLowerRange" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearLowerRange" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearLowerRange" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearUpperRange" xlink:label="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearUpperRange" xlink:title="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearUpperRange" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearUpperRange" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearUpperRange" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear" xlink:label="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear" xlink:title="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="DefinedBenefitPlanContributionsByEmployer" xlink:title="DefinedBenefitPlanContributionsByEmployer" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanContributionsByEmployer" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanContributionsByEmployer" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearLowerRange" xlink:label="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearLowerRange" xlink:title="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearLowerRange" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearLowerRange" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearLowerRange" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearUpperRange" xlink:label="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearUpperRange" xlink:title="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearUpperRange" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearUpperRange" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYearUpperRange" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear" xlink:label="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear" xlink:title="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:title="ScheduleOfDefinedBenefitPlansDisclosuresTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to ScheduleOfDefinedBenefitPlansDisclosuresTable" order="14.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:title="DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:title="definition: ScheduleOfDefinedBenefitPlansDisclosuresTable to DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="DefinedBenefitPlansDomain" xlink:title="DefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="DefinedBenefitPlansDomain" xlink:title="definition: DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis to DefinedBenefitPlansDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="DefinedBenefitPlansDomain_2" xlink:title="DefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="DefinedBenefitPlansDomain_2" xlink:title="definition: DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis to DefinedBenefitPlansDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="PensionPlansDefinedBenefitMember" xlink:title="PensionPlansDefinedBenefitMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlansDomain" xlink:to="PensionPlansDefinedBenefitMember" xlink:title="definition: DefinedBenefitPlansDomain to PensionPlansDefinedBenefitMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:title="OtherPostretirementBenefitPlansDefinedBenefitMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlansDomain" xlink:to="OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:title="definition: DefinedBenefitPlansDomain to OtherPostretirementBenefitPlansDefinedBenefitMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/LegalProceedingsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="LossContingenciesLineItems" xlink:title="LossContingenciesLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease" xlink:label="LossContingencyAccrualCarryingValuePeriodIncreaseDecrease" xlink:title="LossContingencyAccrualCarryingValuePeriodIncreaseDecrease" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LossContingenciesLineItems" xlink:to="LossContingencyAccrualCarryingValuePeriodIncreaseDecrease" xlink:title="definition: LossContingenciesLineItems to LossContingencyAccrualCarryingValuePeriodIncreaseDecrease" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LitigationSettlementExpense" xlink:label="LitigationSettlementExpense" xlink:title="LitigationSettlementExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LossContingenciesLineItems" xlink:to="LitigationSettlementExpense" xlink:title="definition: LossContingenciesLineItems to LitigationSettlementExpense" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainLossRelatedToLitigationSettlement" xlink:label="GainLossRelatedToLitigationSettlement" xlink:title="GainLossRelatedToLitigationSettlement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LossContingenciesLineItems" xlink:to="GainLossRelatedToLitigationSettlement" xlink:title="definition: LossContingenciesLineItems to GainLossRelatedToLitigationSettlement" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="LossContingenciesTable" xlink:title="LossContingenciesTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="LossContingenciesLineItems" xlink:to="LossContingenciesTable" xlink:title="definition: LossContingenciesLineItems to LossContingenciesTable" order="4.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="LossContingenciesByNatureOfContingencyAxis" xlink:title="LossContingenciesByNatureOfContingencyAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="LossContingenciesTable" xlink:to="LossContingenciesByNatureOfContingencyAxis" xlink:title="definition: LossContingenciesTable to LossContingenciesByNatureOfContingencyAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="LossContingencyNatureDomain" xlink:title="LossContingencyNatureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="LossContingenciesByNatureOfContingencyAxis" xlink:to="LossContingencyNatureDomain" xlink:title="definition: LossContingenciesByNatureOfContingencyAxis to LossContingencyNatureDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="LossContingencyNatureDomain_2" xlink:title="LossContingencyNatureDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="LossContingenciesByNatureOfContingencyAxis" xlink:to="LossContingencyNatureDomain_2" xlink:title="definition: LossContingenciesByNatureOfContingencyAxis to LossContingencyNatureDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PendingOrThreatenedLitigationMember" xlink:label="PendingOrThreatenedLitigationMember" xlink:title="PendingOrThreatenedLitigationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LossContingencyNatureDomain" xlink:to="PendingOrThreatenedLitigationMember" xlink:title="definition: LossContingencyNatureDomain to PendingOrThreatenedLitigationMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/ComprehensiveIncomeDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="DefinedBenefitPlanDisclosureLineItems" xlink:title="DefinedBenefitPlanDisclosureLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" xlink:label="AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" xlink:title="AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:title="AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to AccumulatedOtherComprehensiveIncomeLossNetOfTax" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease" xlink:label="OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease" xlink:title="OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="AccumulatedOtherComprehensiveIncomeLossTable" xlink:title="AccumulatedOtherComprehensiveIncomeLossTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DefinedBenefitPlanDisclosureLineItems" xlink:to="AccumulatedOtherComprehensiveIncomeLossTable" xlink:title="definition: DefinedBenefitPlanDisclosureLineItems to AccumulatedOtherComprehensiveIncomeLossTable" order="4.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_AccumulatedOtherComprehensiveIncomeLossComponentsAxis" xlink:label="AccumulatedOtherComprehensiveIncomeLossComponentsAxis" xlink:title="AccumulatedOtherComprehensiveIncomeLossComponentsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="AccumulatedOtherComprehensiveIncomeLossTable" xlink:to="AccumulatedOtherComprehensiveIncomeLossComponentsAxis" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossTable to AccumulatedOtherComprehensiveIncomeLossComponentsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_AccumulatedOtherComprehensiveIncomeLossDomain" xlink:label="AccumulatedOtherComprehensiveIncomeLossDomain" xlink:title="AccumulatedOtherComprehensiveIncomeLossDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="AccumulatedOtherComprehensiveIncomeLossComponentsAxis" xlink:to="AccumulatedOtherComprehensiveIncomeLossDomain" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossComponentsAxis to AccumulatedOtherComprehensiveIncomeLossDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_AccumulatedOtherComprehensiveIncomeLossDomain" xlink:label="AccumulatedOtherComprehensiveIncomeLossDomain_2" xlink:title="AccumulatedOtherComprehensiveIncomeLossDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="AccumulatedOtherComprehensiveIncomeLossComponentsAxis" xlink:to="AccumulatedOtherComprehensiveIncomeLossDomain_2" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossComponentsAxis to AccumulatedOtherComprehensiveIncomeLossDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="PensionPlansDefinedBenefitMember" xlink:title="PensionPlansDefinedBenefitMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccumulatedOtherComprehensiveIncomeLossDomain" xlink:to="PensionPlansDefinedBenefitMember" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossDomain to PensionPlansDefinedBenefitMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_ForeignCurrencyTranslationAccumulatedOtherComprehensiveIncomeMember" xlink:label="ForeignCurrencyTranslationAccumulatedOtherComprehensiveIncomeMember" xlink:title="ForeignCurrencyTranslationAccumulatedOtherComprehensiveIncomeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccumulatedOtherComprehensiveIncomeLossDomain" xlink:to="ForeignCurrencyTranslationAccumulatedOtherComprehensiveIncomeMember" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossDomain to ForeignCurrencyTranslationAccumulatedOtherComprehensiveIncomeMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_DefinedBenefitPensionPlansAccumulatedOtherComprehensiveIncomeMember" xlink:label="DefinedBenefitPensionPlansAccumulatedOtherComprehensiveIncomeMember" xlink:title="DefinedBenefitPensionPlansAccumulatedOtherComprehensiveIncomeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccumulatedOtherComprehensiveIncomeLossDomain" xlink:to="DefinedBenefitPensionPlansAccumulatedOtherComprehensiveIncomeMember" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossDomain to DefinedBenefitPensionPlansAccumulatedOtherComprehensiveIncomeMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_DefinedBenefitPostretirementPlansAccumulatedOtherComprehensiveIncomeMember" xlink:label="DefinedBenefitPostretirementPlansAccumulatedOtherComprehensiveIncomeMember" xlink:title="DefinedBenefitPostretirementPlansAccumulatedOtherComprehensiveIncomeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccumulatedOtherComprehensiveIncomeLossDomain" xlink:to="DefinedBenefitPostretirementPlansAccumulatedOtherComprehensiveIncomeMember" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossDomain to DefinedBenefitPostretirementPlansAccumulatedOtherComprehensiveIncomeMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:title="OtherPostretirementBenefitPlansDefinedBenefitMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AccumulatedOtherComprehensiveIncomeLossDomain" xlink:to="OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:title="definition: AccumulatedOtherComprehensiveIncomeLossDomain to OtherPostretirementBenefitPlansDefinedBenefitMember" order="5.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/NetEarningsPerShareDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:title="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:title="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:title="definition: AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems to AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:title="ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:title="definition: AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems to ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" order="2.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:title="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:to="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:title="definition: ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable to AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="AntidilutiveSecuritiesNameDomain" xlink:title="AntidilutiveSecuritiesNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="AntidilutiveSecuritiesNameDomain" xlink:title="definition: AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis to AntidilutiveSecuritiesNameDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="AntidilutiveSecuritiesNameDomain_2" xlink:title="AntidilutiveSecuritiesNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="AntidilutiveSecuritiesNameDomain_2" xlink:title="definition: AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis to AntidilutiveSecuritiesNameDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockOptionsMember" xlink:label="StockOptionsMember" xlink:title="StockOptionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AntidilutiveSecuritiesNameDomain" xlink:to="StockOptionsMember" xlink:title="definition: AntidilutiveSecuritiesNameDomain to StockOptionsMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/StockCompensationPlansDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationDating" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationDating" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationDating" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationDating" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationDating" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:title="EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" xlink:label="EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" xlink:title="EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationAbstract" xlink:label="ShareBasedCompensationAbstract" xlink:title="ShareBasedCompensationAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationAbstract" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationAbstract" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_WeightedAverageRemainingContractualTermAbstract" xlink:label="WeightedAverageRemainingContractualTermAbstract" xlink:title="WeightedAverageRemainingContractualTermAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="WeightedAverageRemainingContractualTermAbstract" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to WeightedAverageRemainingContractualTermAbstract" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_AggregateIntrinsicValueAbstract" xlink:label="AggregateIntrinsicValueAbstract" xlink:title="AggregateIntrinsicValueAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="AggregateIntrinsicValueAbstract" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to AggregateIntrinsicValueAbstract" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:title="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1" xlink:label="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1" xlink:title="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" order="18.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" order="19.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" order="20.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" order="21.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" order="22.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" order="23.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:title="StockIssuedDuringPeriodSharesStockOptionsExercised" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to StockIssuedDuringPeriodSharesStockOptionsExercised" order="24.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" order="25.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" order="26.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" order="27.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" order="28.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" order="29.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" order="30.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" order="31.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMinimum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMinimum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMinimum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMinimum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMinimum" order="32.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMaximum" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMaximum" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMaximum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMaximum" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermMaximum" order="33.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:title="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" order="34.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="ShareBasedCompensation" xlink:title="ShareBasedCompensation" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ShareBasedCompensation" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ShareBasedCompensation" order="35.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:title="EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" order="36.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax" xlink:label="AllocatedShareBasedCompensationExpenseNetOfTax" xlink:title="AllocatedShareBasedCompensationExpenseNetOfTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="AllocatedShareBasedCompensationExpenseNetOfTax" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to AllocatedShareBasedCompensationExpenseNetOfTax" order="37.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:title="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:title="definition: ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" order="38.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:label="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:title="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:title="definition: ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable to ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:title="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:to="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:title="definition: ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis to ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2" xlink:title="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:to="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2" xlink:title="definition: ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis to ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="RestrictedStockMember" xlink:title="RestrictedStockMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="RestrictedStockMember" xlink:title="definition: ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to RestrictedStockMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockOptionsMember" xlink:label="StockOptionsMember" xlink:title="StockOptionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="StockOptionsMember" xlink:title="definition: ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to StockOptionsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis" xlink:label="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis" xlink:title="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis" xlink:title="definition: ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable to ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" xlink:label="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" xlink:title="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis" xlink:to="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" xlink:title="definition: ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis to ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" xlink:label="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain_2" xlink:title="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis" xlink:to="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain_2" xlink:title="definition: ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientAxis to ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_GrantedToDirectorsMember" xlink:label="GrantedToDirectorsMember" xlink:title="GrantedToDirectorsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" xlink:to="GrantedToDirectorsMember" xlink:title="definition: ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain to GrantedToDirectorsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_GrantedToEmployeesMember" xlink:label="GrantedToEmployeesMember" xlink:title="GrantedToEmployeesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain" xlink:to="GrantedToEmployeesMember" xlink:title="definition: ScheduleOfShare-basedCompensationArrangementByShare-basedPaymentAwardAwardRecipientDomain to GrantedToEmployeesMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/UncertainTaxPositionsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems" xlink:label="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems" xlink:title="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_EstimatedChangeInUnrecognizedTaxPositionsExpectedWithinNextTwelveMonths" xlink:label="EstimatedChangeInUnrecognizedTaxPositionsExpectedWithinNextTwelveMonths" xlink:title="EstimatedChangeInUnrecognizedTaxPositionsExpectedWithinNextTwelveMonths" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems" xlink:to="EstimatedChangeInUnrecognizedTaxPositionsExpectedWithinNextTwelveMonths" xlink:title="definition: SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems to EstimatedChangeInUnrecognizedTaxPositionsExpectedWithinNextTwelveMonths" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" xlink:label="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" xlink:title="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems" xlink:to="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" xlink:title="definition: SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems to SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" order="2.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" xlink:label="ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" xlink:title="ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" xlink:to="ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" xlink:title="definition: SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable to ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" xlink:label="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" xlink:title="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" xlink:to="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" xlink:title="definition: ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis to SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" xlink:label="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_2" xlink:title="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" xlink:to="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_2" xlink:title="definition: ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis to SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_TaxCreditsAndOtherVariousDeductionsMember" xlink:label="TaxCreditsAndOtherVariousDeductionsMember" xlink:title="TaxCreditsAndOtherVariousDeductionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" xlink:to="TaxCreditsAndOtherVariousDeductionsMember" xlink:title="definition: SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain to TaxCreditsAndOtherVariousDeductionsMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://lufkin.com/role/SegmentDataDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="SegmentReportingInformationLineItems" xlink:title="SegmentReportingInformationLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentReportingInformationRevenueAbstract" xlink:label="SegmentReportingInformationRevenueAbstract" xlink:title="SegmentReportingInformationRevenueAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="SegmentReportingInformationRevenueAbstract" xlink:title="definition: SegmentReportingInformationLineItems to SegmentReportingInformationRevenueAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract" xlink:label="SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract" xlink:title="SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract" xlink:title="definition: SegmentReportingInformationLineItems to SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="OperatingIncomeLoss" xlink:title="OperatingIncomeLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="OperatingIncomeLoss" xlink:title="definition: SegmentReportingInformationLineItems to OperatingIncomeLoss" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="NonoperatingIncomeExpense" xlink:title="NonoperatingIncomeExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="NonoperatingIncomeExpense" xlink:title="definition: SegmentReportingInformationLineItems to NonoperatingIncomeExpense" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:title="IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:title="definition: SegmentReportingInformationLineItems to IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentReportingInformationRevenue" xlink:label="SegmentReportingInformationRevenue" xlink:title="SegmentReportingInformationRevenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="SegmentReportingInformationRevenue" xlink:title="definition: SegmentReportingInformationLineItems to SegmentReportingInformationRevenue" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" xlink:label="RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" xlink:title="RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" xlink:title="definition: SegmentReportingInformationLineItems to RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Revenues" xlink:label="Revenues" xlink:title="Revenues" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="Revenues" xlink:title="definition: SegmentReportingInformationLineItems to Revenues" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="ScheduleOfSegmentReportingInformationBySegmentTable" xlink:title="ScheduleOfSegmentReportingInformationBySegmentTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="SegmentReportingInformationLineItems" xlink:to="ScheduleOfSegmentReportingInformationBySegmentTable" xlink:title="definition: SegmentReportingInformationLineItems to ScheduleOfSegmentReportingInformationBySegmentTable" order="9.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="StatementBusinessSegmentsAxis" xlink:title="StatementBusinessSegmentsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="StatementBusinessSegmentsAxis" xlink:title="definition: ScheduleOfSegmentReportingInformationBySegmentTable to StatementBusinessSegmentsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentDomain" xlink:label="SegmentDomain" xlink:title="SegmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementBusinessSegmentsAxis" xlink:to="SegmentDomain" xlink:title="definition: StatementBusinessSegmentsAxis to SegmentDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentDomain" xlink:label="SegmentDomain_2" xlink:title="SegmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementBusinessSegmentsAxis" xlink:to="SegmentDomain_2" xlink:title="definition: StatementBusinessSegmentsAxis to SegmentDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_OilFieldMember" xlink:label="OilFieldMember" xlink:title="OilFieldMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentDomain" xlink:to="OilFieldMember" xlink:title="definition: SegmentDomain to OilFieldMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="lufk-20120331.xsd#lufk_PowerTransmissionMember" xlink:label="PowerTransmissionMember" xlink:title="PowerTransmissionMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentDomain" xlink:to="PowerTransmissionMember" xlink:title="definition: SegmentDomain to PowerTransmissionMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllOtherSegmentsMember" xlink:label="AllOtherSegmentsMember" xlink:title="AllOtherSegmentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentDomain" xlink:to="AllOtherSegmentsMember" xlink:title="definition: SegmentDomain to AllOtherSegmentsMember" order="3.0" />
  </link:definitionLink>
</link:linkbase>
