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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_501995A4FAF8019301B9072857C0E915_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_501995A4FAF8019301B9072857C0E915" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_501995A4FAF8019301B9072857C0E915" xlink:type="locator" />
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    <link:label id="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_518640C0D01D039A7F74072857C1F8ED_documentation_en-US" xlink:label="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_518640C0D01D039A7F74072857C1F8ED" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Fee percentage</link:label>
    <link:loc xlink:href="trs-20190630.xsd#trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage" xlink:label="loc_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_518640C0D01D039A7F74072857C1F8ED" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SecuredDebt_29A67974F79D37CC39C2072857C29A6E_label_en-US" xlink:label="lab_us-gaap_SecuredDebt_29A67974F79D37CC39C2072857C29A6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_29A67974F79D37CC39C2072857C29A6E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_AF829CF3AD8EED24F89F072857C21733_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_AF829CF3AD8EED24F89F072857C21733" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Receivables facility debt available but not utilized</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_AF829CF3AD8EED24F89F072857C21733" xlink:type="locator" />
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    <link:label id="lab_trs_ReceivablesFacililtyDebtAggregateCosts_A3A0CBAFEB51737A04AD072857C21024_documentation_en-US" xlink:label="lab_trs_ReceivablesFacililtyDebtAggregateCosts_A3A0CBAFEB51737A04AD072857C21024" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of the fee that accompanies borrowing money under the debt instrument.</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_CEDE62C658574994EF66072857C241F8_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_CEDE62C658574994EF66072857C241F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Maturity Date</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_CEDE62C658574994EF66072857C241F8" xlink:type="locator" />
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    <link:label id="lab_trs_AverageliquidationperiodReceivablespool_B2EDB2900A84DD2EC6A5072857C25CEC_label_en-US" xlink:label="lab_trs_AverageliquidationperiodReceivablespool_B2EDB2900A84DD2EC6A5072857C25CEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average liquidation period, Receivables pool</link:label>
    <link:label id="lab_trs_AverageliquidationperiodReceivablespool_B2EDB2900A84DD2EC6A5072857C25CEC_documentation_en-US" xlink:label="lab_trs_AverageliquidationperiodReceivablespool_B2EDB2900A84DD2EC6A5072857C25CEC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Average liquidation period, Receivables pool</link:label>
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    <link:label id="lab_trs_AverageDiscountRateReceivablesFacility_F2642E7ADCAD2F778655072857C3535F_terseLabel_en-US" xlink:label="lab_trs_AverageDiscountRateReceivablesFacility_F2642E7ADCAD2F778655072857C3535F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average discount rate, Receivables facility</link:label>
    <link:label id="lab_trs_AverageDiscountRateReceivablesFacility_F2642E7ADCAD2F778655072857C3535F_label_en-US" xlink:label="lab_trs_AverageDiscountRateReceivablesFacility_F2642E7ADCAD2F778655072857C3535F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average discount rate, Receivables facility</link:label>
    <link:label id="lab_trs_AverageDiscountRateReceivablesFacility_F2642E7ADCAD2F778655072857C3535F_documentation_en-US" xlink:label="lab_trs_AverageDiscountRateReceivablesFacility_F2642E7ADCAD2F778655072857C3535F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The average discount rate utilized to calculate the present value of the receivables sold under the facility debt arrangement.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts" xlink:label="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_1D96A0EEA56854828E4D072857FBD9B1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_539995A41D8E6C131205072857FB31F4_label_en-US" xlink:label="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_539995A41D8E6C131205072857FB31F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Write off of Deferred Debt Issuance Cost</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EE89AD52A8367C5A4D21072857FB2D15_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EE89AD52A8367C5A4D21072857FB2D15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Capacity Available for Foreign Revolver Loans</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EE89AD52A8367C5A4D21072857FB2D15_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EE89AD52A8367C5A4D21072857FB2D15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EE89AD52A8367C5A4D21072857FB2D15" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_001948F483DCB41FCFB2072857FCD2D2_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_001948F483DCB41FCFB2072857FCD2D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_001948F483DCB41FCFB2072857FCD2D2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_8268A9EDFA704DDA712C072857FDEB04_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_8268A9EDFA704DDA712C072857FDEB04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_8268A9EDFA704DDA712C072857FDEB04_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_8268A9EDFA704DDA712C072857FDEB04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_8268A9EDFA704DDA712C072857FDEB04" xlink:type="locator" />
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    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_864D3F07CF765D9536F5072857FD6163_documentation_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_864D3F07CF765D9536F5072857FD6163" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity.</link:label>
    <link:loc xlink:href="trs-20190630.xsd#trs_IncrementalDebtCommitmentsCapacity" xlink:label="loc_trs_IncrementalDebtCommitmentsCapacity_864D3F07CF765D9536F5072857FD6163" xlink:type="locator" />
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    <link:label id="lab_trs_NetLeverageRatio_F01C4C2E124F94745335072857FD7E28_label_en-US" xlink:label="lab_trs_NetLeverageRatio_F01C4C2E124F94745335072857FD7E28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net leverage ratio</link:label>
    <link:label id="lab_trs_NetLeverageRatio_F01C4C2E124F94745335072857FD7E28_documentation_en-US" xlink:label="lab_trs_NetLeverageRatio_F01C4C2E124F94745335072857FD7E28" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net leverage ratio, as defined</link:label>
    <link:loc xlink:href="trs-20190630.xsd#trs_NetLeverageRatio" xlink:label="loc_trs_NetLeverageRatio_F01C4C2E124F94745335072857FD7E28" xlink:type="locator" />
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    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_A04521D1528FCBF7A7CA072857FDCDC3_label_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_A04521D1528FCBF7A7CA072857FDCDC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_A04521D1528FCBF7A7CA072857FDCDC3_documentation_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_A04521D1528FCBF7A7CA072857FDCDC3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity under the letters of credit.</link:label>
    <link:loc xlink:href="trs-20190630.xsd#trs_LetterOfCreditMaximumBorrowingCapacity" xlink:label="loc_trs_LetterOfCreditMaximumBorrowingCapacity_A04521D1528FCBF7A7CA072857FDCDC3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCredit_0626561655A1E3C565D1072857FE6FC8_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_0626561655A1E3C565D1072857FE6FC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Amount Outstanding</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_0626561655A1E3C565D1072857FE6FC8_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_0626561655A1E3C565D1072857FE6FC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
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    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_05209DC98CC965E5A13B072857FFB603_documentation_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_05209DC98CC965E5A13B072857FFB603" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The fair value of long-term debt presented as a % of par value.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ABED56A68F17C2EF8CF72A482715703B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_4B58EEE52EDC496A23922A4827177C4B_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_4B58EEE52EDC496A23922A4827177C4B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings on revolving credit facilities</link:label>
    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_4B58EEE52EDC496A23922A4827177C4B_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_4B58EEE52EDC496A23922A4827177C4B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Lines of Credit</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C04449B342590EB31E3207285662CDEB" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_D283FBB61F7BC41CFBCA0728566298F3" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_D39304BE03AC0970CC0C07285663329E" xlink:type="locator" />
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