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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_RedemptionIncreaseInOwnershipPercentage" xlink:label="RedemptionIncreaseInOwnershipPercentage" xlink:title="RedemptionIncreaseInOwnershipPercentage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="RedemptionIncreaseInOwnershipPercentage" xlink:title="definition: BusinessAcquisitionLineItems to RedemptionIncreaseInOwnershipPercentage" use="optional" order="4.0"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" use="optional" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryIncreaseInAssets" xlink:label="ConsolidationOfSubsidiaryIncreaseInAssets" xlink:title="ConsolidationOfSubsidiaryIncreaseInAssets"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryIncreaseInAssets" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryIncreaseInAssets" use="optional" order="6.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryIncreaseInPropertyPlantAndEquipment" xlink:label="ConsolidationOfSubsidiaryIncreaseInPropertyPlantAndEquipment" xlink:title="ConsolidationOfSubsidiaryIncreaseInPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryIncreaseInPropertyPlantAndEquipment" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryIncreaseInPropertyPlantAndEquipment" use="optional" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryIncreaseInInventory" xlink:label="ConsolidationOfSubsidiaryIncreaseInInventory" xlink:title="ConsolidationOfSubsidiaryIncreaseInInventory"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryIncreaseInInventory" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryIncreaseInInventory" use="optional" order="8.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryIncreaseInReceivables" xlink:label="ConsolidationOfSubsidiaryIncreaseInReceivables" xlink:title="ConsolidationOfSubsidiaryIncreaseInReceivables"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryIncreaseInReceivables" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryIncreaseInReceivables" use="optional" order="9.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryIncreaseInGoodwillAndIntangibles" xlink:label="ConsolidationOfSubsidiaryIncreaseInGoodwillAndIntangibles" xlink:title="ConsolidationOfSubsidiaryIncreaseInGoodwillAndIntangibles"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryIncreaseInGoodwillAndIntangibles" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryIncreaseInGoodwillAndIntangibles" use="optional" order="10.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryReductionInInvestmentInAffiliates" xlink:label="ConsolidationOfSubsidiaryReductionInInvestmentInAffiliates" xlink:title="ConsolidationOfSubsidiaryReductionInInvestmentInAffiliates"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryReductionInInvestmentInAffiliates" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryReductionInInvestmentInAffiliates" use="optional" order="11.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryIncreaseInNetLiabilities" xlink:label="ConsolidationOfSubsidiaryIncreaseInNetLiabilities" xlink:title="ConsolidationOfSubsidiaryIncreaseInNetLiabilities"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryIncreaseInNetLiabilities" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryIncreaseInNetLiabilities" use="optional" order="12.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryIncreaseInDebt" xlink:label="ConsolidationOfSubsidiaryIncreaseInDebt" xlink:title="ConsolidationOfSubsidiaryIncreaseInDebt"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryIncreaseInDebt" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryIncreaseInDebt" use="optional" order="13.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BookValueOfNoncontrollingInterestInNewlyConsolidatedSubsidiary" xlink:label="BookValueOfNoncontrollingInterestInNewlyConsolidatedSubsidiary" xlink:title="BookValueOfNoncontrollingInterestInNewlyConsolidatedSubsidiary"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BookValueOfNoncontrollingInterestInNewlyConsolidatedSubsidiary" xlink:title="definition: BusinessAcquisitionLineItems to BookValueOfNoncontrollingInterestInNewlyConsolidatedSubsidiary" use="optional" order="14.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ConsolidationOfSubsidiaryTemporaryEquityDecreaseInRetainedEarningsAdjustCarryingValueOfRedeemableNoncontrollingInterestToRedemptionValue" xlink:label="ConsolidationOfSubsidiaryTemporaryEquityDecreaseInRetainedEarningsAdjustCarryingValueOfRedeemableNoncontrollingInterestToRedemptionValue" xlink:title="ConsolidationOfSubsidiaryTemporaryEquityDecreaseInRetainedEarningsAdjustCarryingValueOfRedeemableNoncontrollingInterestToRedemptionValue"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="ConsolidationOfSubsidiaryTemporaryEquityDecreaseInRetainedEarningsAdjustCarryingValueOfRedeemableNoncontrollingInterestToRedemptionValue" xlink:title="definition: BusinessAcquisitionLineItems to ConsolidationOfSubsidiaryTemporaryEquityDecreaseInRetainedEarningsAdjustCarryingValueOfRedeemableNoncontrollingInterestToRedemptionValue" use="optional" order="15.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BusinessAcquisitionCostOfAcquiredEntityPostClosingAdjustmentUnpaid" xlink:label="BusinessAcquisitionCostOfAcquiredEntityPostClosingAdjustmentUnpaid" xlink:title="BusinessAcquisitionCostOfAcquiredEntityPostClosingAdjustmentUnpaid"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BusinessAcquisitionEmployeeBenefitLiabilityIncurred" xlink:label="BusinessAcquisitionEmployeeBenefitLiabilityIncurred" xlink:title="BusinessAcquisitionEmployeeBenefitLiabilityIncurred"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_OptionsOnMinorityInterestPeriodOfTimeUntilExercisable" xlink:label="OptionsOnMinorityInterestPeriodOfTimeUntilExercisable" xlink:title="OptionsOnMinorityInterestPeriodOfTimeUntilExercisable"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_RequiredFundingPeriodJointVenture" xlink:label="RequiredFundingPeriodJointVenture" xlink:title="RequiredFundingPeriodJointVenture"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BusinessAcquisitionAdditionalAssetsAcquired" xlink:label="BusinessAcquisitionAdditionalAssetsAcquired" xlink:title="BusinessAcquisitionAdditionalAssetsAcquired"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_AdditionalFundingCommitmentTerm" xlink:label="AdditionalFundingCommitmentTerm" xlink:title="AdditionalFundingCommitmentTerm"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxLiabilities" xlink:label="BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxLiabilities" xlink:title="BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxLiabilities"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxLiabilities" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxLiabilities" use="optional" order="23.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BusinessAcquisitionPurchasePriceAllocationTangibleAssetsAcquiredLiabilitiesAssumedNet" xlink:label="BusinessAcquisitionPurchasePriceAllocationTangibleAssetsAcquiredLiabilitiesAssumedNet" xlink:title="BusinessAcquisitionPurchasePriceAllocationTangibleAssetsAcquiredLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationTangibleAssetsAcquiredLiabilitiesAssumedNet" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationTangibleAssetsAcquiredLiabilitiesAssumedNet" use="optional" order="24.0"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.cat.com/role/DisclosureBusinessCombinationsDetails">
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    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="ScenarioPreviouslyReportedMember" xlink:title="ScenarioPreviouslyReportedMember"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ScenarioUnspecifiedDomain" xlink:to="ScenarioAdjustmentMember" xlink:title="definition: ScenarioUnspecifiedDomain to ScenarioAdjustmentMember" use="optional" 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_StatementBusinessSegmentsAxis" xlink:label="StatementBusinessSegmentsAxis" xlink:title="StatementBusinessSegmentsAxis"/>
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    <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" use="optional" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_InProcessResearchAndDevelopmentMember" xlink:label="InProcessResearchAndDevelopmentMember" xlink:title="InProcessResearchAndDevelopmentMember"/>
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    <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"/>
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    <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"/>
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    <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"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_FCMRailLtdMember" xlink:label="FCMRailLtdMember" xlink:title="FCMRailLtdMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ElectroMotiveDieselMember" xlink:label="ElectroMotiveDieselMember" xlink:title="ElectroMotiveDieselMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_GETransportationInspectionProductsBusinessMember" xlink:label="GETransportationInspectionProductsBusinessMember" xlink:title="GETransportationInspectionProductsBusinessMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_JCSCompanyLtdMember" xlink:label="JCSCompanyLtdMember" xlink:title="JCSCompanyLtdMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_NC2JointVentureMember" xlink:label="NC2JointVentureMember" xlink:title="NC2JointVentureMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BucyrusInternationalIncMember" xlink:label="BucyrusInternationalIncMember" xlink:title="BucyrusInternationalIncMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BalfourBeattyTrackworkBusinessMember" xlink:label="BalfourBeattyTrackworkBusinessMember" xlink:title="BalfourBeattyTrackworkBusinessMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_MWMHoldingMember" xlink:label="MWMHoldingMember" xlink:title="MWMHoldingMember"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="MWMHoldingMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to MWMHoldingMember" use="optional" order="1.0"/>
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    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="DebtInstrumentNameDomain_2" xlink:title="DebtInstrumentNameDomain"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="GremadaIndustriesIncMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to GremadaIndustriesIncMember" use="optional" order="9.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_FCMRailLtdMember" xlink:label="FCMRailLtdMember" xlink:title="FCMRailLtdMember"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="FCMRailLtdMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to FCMRailLtdMember" use="optional" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_ElectroMotiveDieselMember" xlink:label="ElectroMotiveDieselMember" xlink:title="ElectroMotiveDieselMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_GETransportationInspectionProductsBusinessMember" xlink:label="GETransportationInspectionProductsBusinessMember" xlink:title="GETransportationInspectionProductsBusinessMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_JCSCompanyLtdMember" xlink:label="JCSCompanyLtdMember" xlink:title="JCSCompanyLtdMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_BucyrusInternationalIncMember" xlink:label="BucyrusInternationalIncMember" xlink:title="BucyrusInternationalIncMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_MWMHoldingMember" xlink:label="MWMHoldingMember" xlink:title="MWMHoldingMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_PyrobanGroupLimitedMember" xlink:label="PyrobanGroupLimitedMember" xlink:title="PyrobanGroupLimitedMember"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GoodwillRollForward" xlink:to="GoodwillImpairmentLoss" xlink:title="definition: GoodwillRollForward to GoodwillImpairmentLoss" use="optional" order="1.0"/>
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    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:label="GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:title="GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
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    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments" xlink:label="GoodwillTranslationAndPurchaseAccountingAdjustments" xlink:title="GoodwillTranslationAndPurchaseAccountingAdjustments"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_MotorenWerkeMannheimMember" xlink:label="MotorenWerkeMannheimMember" xlink:title="MotorenWerkeMannheimMember"/>
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    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="CashAcquiredFromAcquisition" xlink:title="CashAcquiredFromAcquisition"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_FinancialProductsMember" xlink:label="FinancialProductsMember" xlink:title="FinancialProductsMember"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:title="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_FairValueByAssetOrLiabilityClassAxis" xlink:label="FairValueByAssetOrLiabilityClassAxis_2" xlink:title="FairValueByAssetOrLiabilityClassAxis"/>
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    <link:loc xlink:type="locator" xlink:href="cat-20111231.xsd#cat_FairValueAssetsOrLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetOrLiabilityClassDomain" xlink:label="FairValueAssetsOrLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetOrLiabilityClassDomain_2" xlink:title="FairValueAssetsOrLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetOrLiabilityClassDomain"/>
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