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    <link:label id="lab_srt_RangeMember_01489FC489C52AAF7968189C06389DBE_label_en-US" xlink:label="lab_srt_RangeMember_01489FC489C52AAF7968189C06389DBE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_64D73E7E19B19DCCE215189C06381D35_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_64D73E7E19B19DCCE215189C06381D35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_64D73E7E19B19DCCE215189C06381D35_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_64D73E7E19B19DCCE215189C06381D35" 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/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_64D73E7E19B19DCCE215189C06381D35" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_EED5C2BE87F93EDF370C189C06382E63_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_EED5C2BE87F93EDF370C189C06382E63" 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_EED5C2BE87F93EDF370C189C06382E63_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_EED5C2BE87F93EDF370C189C06382E63" 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/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_EED5C2BE87F93EDF370C189C06382E63" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_14BD29AB3DE25A84B753189C063878AB_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_14BD29AB3DE25A84B753189C063878AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_14BD29AB3DE25A84B753189C063878AB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_6DF69BFA0FD35C17A878189C06387B82_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_6DF69BFA0FD35C17A878189C06387B82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Maturity Date</link:label>
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    <link:label id="lab_us-gaap_Goodwill_D1AB90EBC2B7444D10501806E1713F8B_label_en-US" xlink:label="lab_us-gaap_Goodwill_D1AB90EBC2B7444D10501806E1713F8B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
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    <link:label id="lab_trs_Plan5Member_A527FCCA3DF4F568ACD3486CB67E6C38_label_en-US" xlink:label="lab_trs_Plan5Member_A527FCCA3DF4F568ACD3486CB67E6C38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 5 [Member]</link:label>
    <link:label id="lab_trs_Plan5Member_A527FCCA3DF4F568ACD3486CB67E6C38_documentation_en-US" xlink:label="lab_trs_Plan5Member_A527FCCA3DF4F568ACD3486CB67E6C38" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
    <link:loc xlink:href="trs-20190930.xsd#trs_Plan5Member" xlink:label="loc_trs_Plan5Member_A527FCCA3DF4F568ACD3486CB67E6C38" xlink:type="locator" />
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    <link:label id="lab_trs_Plan7Member_FE262B1BCB602420FBF3486CB67ECC48_label_en-US" xlink:label="lab_trs_Plan7Member_FE262B1BCB602420FBF3486CB67ECC48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 7 [Member]</link:label>
    <link:label id="lab_trs_Plan7Member_FE262B1BCB602420FBF3486CB67ECC48_documentation_en-US" xlink:label="lab_trs_Plan7Member_FE262B1BCB602420FBF3486CB67ECC48" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Plan 7 [Member]</link:label>
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    <link:label id="lab_us-gaap_GoodwillRollForward_606B471DC340F75F406E486CB5589B34_label_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_606B471DC340F75F406E486CB5589B34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Roll Forward]</link:label>
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    <link:label id="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_60CB82D339CDF5205134486CB6622990_terseLabel_en-US" xlink:label="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_60CB82D339CDF5205134486CB6622990" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Write off of Deferred Debt Issuance Cost</link:label>
    <link:label id="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_60CB82D339CDF5205134486CB6622990_label_en-US" xlink:label="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_60CB82D339CDF5205134486CB6622990" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_60CB82D339CDF5205134486CB6622990" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_FB9F9AA938CD6EDC3C71486CB662B12C_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_FB9F9AA938CD6EDC3C71486CB662B12C" 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_FB9F9AA938CD6EDC3C71486CB662B12C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_FB9F9AA938CD6EDC3C71486CB662B12C" 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/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_FB9F9AA938CD6EDC3C71486CB662B12C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2E50FD2620866C029B19486CB66210E9_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2E50FD2620866C029B19486CB66210E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2E50FD2620866C029B19486CB66210E9_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2E50FD2620866C029B19486CB66210E9" 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/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2E50FD2620866C029B19486CB66210E9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2E50FD2620866C029B19486CB66210E9" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2E50FD2620866C029B19486CB66210E9" xlink:type="arc" />
    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_B4E7E68AC40F5C0D4ED8486CB663BB8A_terseLabel_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_B4E7E68AC40F5C0D4ED8486CB663BB8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity</link:label>
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    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_B4E7E68AC40F5C0D4ED8486CB663BB8A_documentation_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_B4E7E68AC40F5C0D4ED8486CB663BB8A" 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-20190930.xsd#trs_IncrementalDebtCommitmentsCapacity" xlink:label="loc_trs_IncrementalDebtCommitmentsCapacity_B4E7E68AC40F5C0D4ED8486CB663BB8A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_IncrementalDebtCommitmentsCapacity_B4E7E68AC40F5C0D4ED8486CB663BB8A" xlink:to="lab_trs_IncrementalDebtCommitmentsCapacity_B4E7E68AC40F5C0D4ED8486CB663BB8A" xlink:type="arc" />
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    <link:label id="lab_trs_NetLeverageRatio_0302B85158133CA76CA2486CB6636929_label_en-US" xlink:label="lab_trs_NetLeverageRatio_0302B85158133CA76CA2486CB6636929" 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_0302B85158133CA76CA2486CB6636929_documentation_en-US" xlink:label="lab_trs_NetLeverageRatio_0302B85158133CA76CA2486CB6636929" 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-20190930.xsd#trs_NetLeverageRatio" xlink:label="loc_trs_NetLeverageRatio_0302B85158133CA76CA2486CB6636929" xlink:type="locator" />
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    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035_terseLabel_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035_label_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035" 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_FDEEAC6DB9FCADFDD11A486CB663D035_documentation_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035" 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-20190930.xsd#trs_LetterOfCreditMaximumBorrowingCapacity" xlink:label="loc_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035" xlink:to="lab_trs_LetterOfCreditMaximumBorrowingCapacity_FDEEAC6DB9FCADFDD11A486CB663D035" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCredit_EEC7FC318C8C59BA7595486CB66372FC_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_EEC7FC318C8C59BA7595486CB66372FC" 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_EEC7FC318C8C59BA7595486CB66372FC_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_EEC7FC318C8C59BA7595486CB66372FC" 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_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D74A2C9F2A74D50FF947486CB6633AA6_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D74A2C9F2A74D50FF947486CB6633AA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Remaining Borrowing Capacity</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D74A2C9F2A74D50FF947486CB6633AA6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_099F8C4041039B8416BC486CB6636981_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_099F8C4041039B8416BC486CB6636981" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_099F8C4041039B8416BC486CB6636981_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_099F8C4041039B8416BC486CB6636981" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_099F8C4041039B8416BC486CB6636981" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount_099F8C4041039B8416BC486CB6636981" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount_099F8C4041039B8416BC486CB6636981" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_B4A0B5CA2B4B7198975C486CB664F0C8_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_B4A0B5CA2B4B7198975C486CB664F0C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Amount</link:label>
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    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_50A960BB1BF4F820D766486CB6648F2A_terseLabel_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_50A960BB1BF4F820D766486CB6648F2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Fair Value, % of par value</link:label>
    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_50A960BB1BF4F820D766486CB6648F2A_label_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_50A960BB1BF4F820D766486CB6648F2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Fair Value, % of par value</link:label>
    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_50A960BB1BF4F820D766486CB6648F2A_documentation_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_50A960BB1BF4F820D766486CB6648F2A" 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:label id="lab_us-gaap_ScheduleOfStockByClassTable_E5CFB54F38C984AAEEF8486CB652A05A_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfStockByClassTable_E5CFB54F38C984AAEEF8486CB652A05A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Stock by Class [Table]</link:label>
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