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  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/exch/2012-01-31" schemaLocation="http://xbrl.sec.gov/exch/2012/exch-2012-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/country/2012-01-31" schemaLocation="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/currency/2012-01-31" schemaLocation="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd" />
  <!-- elements -->
  <element name="DocumentAndEntityInformationAbstract" id="pkohi_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element name="OtherPostretirementBenefitsAndOtherLongTermLiabilities" id="pkohi_OtherPostretirementBenefitsAndOtherLongTermLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element name="IncomeLossBeforeIncomeTax" id="pkohi_IncomeLossBeforeIncomeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element name="IncreaseDecreaseInInventoriesAndOtherCurrentAssets" id="pkohi_IncreaseDecreaseInInventoriesAndOtherCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element name="BankDebtIssueCosts" id="pkohi_BankDebtIssueCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element name="CondensedFinancialStatementsDisclosureTextBlock" id="pkohi_CondensedFinancialStatementsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element name="SupplementalGuarantorInformationAbstract" id="pkohi_SupplementalGuarantorInformationAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_RedemptionOfSeniorSubordinatedNotesDue" name="RedemptionOfSeniorSubordinatedNotesDue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="pkohi_SupplyTechnologiesMember" name="SupplyTechnologiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_AluminumProductsMember" name="AluminumProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_ManufacturedProductsMember" name="ManufacturedProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_SegmentsTextualAbstract" name="SegmentsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_SharedBasedCompensationTextualAbstract" name="SharedBasedCompensationTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_IncomeTaxesTextualAbstract" name="IncomeTaxesTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_FairValueMeasurementsTextualAbstract" name="FairValueMeasurementsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_TermLoanMember" name="TermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_FinancingArrangementsTextualAbstract" name="FinancingArrangementsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_AccountsReceivableTextualAbstract" name="AccountsReceivableTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_BusinessAcquisitionPurchasePriceAllocationCustomerRelationships" name="BusinessAcquisitionPurchasePriceAllocationCustomerRelationships" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="pkohi_BusinessAcquisitionPurchasePriceAllocationTrademarksAndTradeName" name="BusinessAcquisitionPurchasePriceAllocationTrademarksAndTradeName" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="pkohi_GoodwillAndOtherIntangibleAssetsTextualAbstract" name="GoodwillAndOtherIntangibleAssetsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_ChangesInAcquisitionCost" name="ChangesInAcquisitionCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="pkohi_SupplementalGuarantorInformationTextualAbstract" name="SupplementalGuarantorInformationTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_GuarantorSubsidiaries" name="GuarantorSubsidiaries" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_OtherAssetsCurrentIncludingUnbilledContractRevenue" name="OtherAssetsCurrentIncludingUnbilledContractRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="pkohi_OtherAssetsNoncurrentIncludingGoodwillAndOtherIntangibleAssets" name="OtherAssetsNoncurrentIncludingGoodwillAndOtherIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="pkohi_LiabilityInterCompanyAdvances" name="LiabilityInterCompanyAdvances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="pkohi_CondensedConsolidatingBalanceSheetAbstract" name="CondensedConsolidatingBalanceSheetAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_IncomeLossFromSubsidiaries" name="IncomeLossFromSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="pkohi_GainOfBondRedemption" name="GainOfBondRedemption" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="pkohi_CondensedConsolidatingStatementOfCashFlowsAbstract" name="CondensedConsolidatingStatementOfCashFlowsAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_ProceedsFromBondRedemption" name="ProceedsFromBondRedemption" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="pkohi_IntercompanyAccountChange" name="IntercompanyAccountChange" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="pkohi_EstimatedEffectiveIncomeTaxRate" name="EstimatedEffectiveIncomeTaxRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_OtherLongTermDebtMember" name="OtherLongTermDebtMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_SaleOfAccountReceivable" name="SaleOfAccountReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="pkohi_LossOnSaleOfAccountReceivable" name="LossOnSaleOfAccountReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="pkohi_ScheduleOfAcquiredFiniteAndIndefiniteLivedIntangibleAssetByMajorClassTable" name="ScheduleOfAcquiredFiniteAndIndefiniteLivedIntangibleAssetByMajorClassTable" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_AcquiredFiniteAndIndefiniteLivedIntangibleAssetsLineItems" name="AcquiredFiniteAndIndefiniteLivedIntangibleAssetsLineItems" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_DebtInstrumentMaturityYear" name="DebtInstrumentMaturityYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_LineOfCreditFacilityRevisedMaximumBorrowingCapacity" name="LineOfCreditFacilityRevisedMaximumBorrowingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="pkohi_DebtInstrumentBasisSpreadOnBanksPrimeLendingRate" name="DebtInstrumentBasisSpreadOnBanksPrimeLendingRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_LineOfCreditAmortizationPeriod" name="LineOfCreditAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_TermLoanAvailable" name="TermLoanAvailable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="pkohi_AcquisitionAdditionalTextualAbstract" name="AcquisitionAdditionalTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_BusinessCombinationTermLoanPeriod" name="BusinessCombinationTermLoanPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_AcquisitionTextualAbstract" name="AcquisitionTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_SharedBasedCompensationAdditionalTextualAbstract" name="SharedBasedCompensationAdditionalTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_PricePerShareOfRestrictedStockAwardNetOfForfeitures" name="PricePerShareOfRestrictedStockAwardNetOfForfeitures" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_CarryingValueOfSeniorNotes" name="CarryingValueOfSeniorNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="pkohi_CompensatoryDamagesRelatedToArbitration" name="CompensatoryDamagesRelatedToArbitration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="pkohi_NonPaymentOfFeesAndExpensesRelatedToArbitration" name="NonPaymentOfFeesAndExpensesRelatedToArbitration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="pkohi_ComprehensiveLossTextualAbstract" name="ComprehensiveLossTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_ConsolidatingStatementOfOperationsAbstract" name="ConsolidatingStatementOfOperationsAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_InterestRateOnTermLoan" name="InterestRateOnTermLoan" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="pkohi_WrittenOffOfPreviouslyReservedAmount" name="WrittenOffOfPreviouslyReservedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
</schema>
