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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_34B43A1E9E737D0D2D8581E78CB3F219_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_34B43A1E9E737D0D2D8581E78CB3F219" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used for financing activities</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_FF7E5B207CB23DE8E02D81E78CB4588B_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_FF7E5B207CB23DE8E02D81E78CB4588B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Excluding Capitalized Interest, Operating Activities</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaid_30361CD7798659B8C82981E78CB42F73_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_30361CD7798659B8C82981E78CB42F73" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid</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_RestructuringReserveAcceleratedDepreciation" xlink:label="loc_us-gaap_RestructuringReserveAcceleratedDepreciation_73A45A826D5333D78E1481E78BD134E9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RevolvingCreditFacilityMember_D88433D427C0752B7D113C31C5D7F05B_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_D88433D427C0752B7D113C31C5D7F05B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility [Member]</link:label>
    <link:label id="lab_us-gaap_RevolvingCreditFacilityMember_D88433D427C0752B7D113C31C5D7F05B_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_D88433D427C0752B7D113C31C5D7F05B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_D88433D427C0752B7D113C31C5D7F05B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LetterOfCreditMember_023C98125732152CB3443C31C5D7D19D_terseLabel_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_023C98125732152CB3443C31C5D7D19D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit [Member]</link:label>
    <link:label id="lab_us-gaap_LetterOfCreditMember_023C98125732152CB3443C31C5D7D19D_label_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_023C98125732152CB3443C31C5D7D19D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit [Member]</link:label>
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    <link:label id="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784_terseLabel_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit and term loan facilities [Member]</link:label>
    <link:label id="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784_label_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolving credit and term loan facilities [Member]</link:label>
    <link:label id="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784_documentation_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount; as well as debt instruments with maturities ranging from five to ten years.</link:label>
    <link:loc xlink:href="trs-20191231.xsd#trs_RevolvingCreditAndTermLoanFacilitiesMember" xlink:label="loc_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784" xlink:to="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_E38B43B135EB4349B2B13C31C5D88784" xlink:type="arc" />
    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_ADCE2AC843E87A469F3B3C31C5D99703_terseLabel_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_ADCE2AC843E87A469F3B3C31C5D99703" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bank debt and receivables facility [Member]</link:label>
    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_ADCE2AC843E87A469F3B3C31C5D99703_label_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_ADCE2AC843E87A469F3B3C31C5D99703" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bank debt and receivables facility [Member]</link:label>
    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_ADCE2AC843E87A469F3B3C31C5D99703_documentation_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_ADCE2AC843E87A469F3B3C31C5D99703" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars, inside the reporting entity's home country; and, collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity's assets.</link:label>
    <link:loc xlink:href="trs-20191231.xsd#trs_BankdebtandreceivablesfacilityMember" xlink:label="loc_trs_BankdebtandreceivablesfacilityMember_ADCE2AC843E87A469F3B3C31C5D99703" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_FC982DC8DC4AC9BAA7393C31C5D94BFF_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_FC982DC8DC4AC9BAA7393C31C5D94BFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_FC982DC8DC4AC9BAA7393C31C5D94BFF_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_FC982DC8DC4AC9BAA7393C31C5D94BFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_FC982DC8DC4AC9BAA7393C31C5D94BFF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_303B5626DC9FE084D7063C31C5DA0D34_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_303B5626DC9FE084D7063C31C5DA0D34" 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_303B5626DC9FE084D7063C31C5DA0D34" xlink:type="locator" />
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    <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_0B714B6092B1F0CD04A43C31C5DA5FCA" xlink:type="locator" />
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    <link:loc xlink:href="trs-20191231.xsd#trs_IncrementalDebtCommitmentsCapacity" xlink:label="loc_trs_IncrementalDebtCommitmentsCapacity_E2669CDD784C5A68BCF53C31C5DA6811" xlink:type="locator" />
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    <link:label id="lab_trs_NetLeverageRatio_86B20B25D2FD6BB23D9D3C31C5DAA761_terseLabel_en-US" xlink:label="lab_trs_NetLeverageRatio_86B20B25D2FD6BB23D9D3C31C5DAA761" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net leverage ratio</link:label>
    <link:label id="lab_trs_NetLeverageRatio_86B20B25D2FD6BB23D9D3C31C5DAA761_label_en-US" xlink:label="lab_trs_NetLeverageRatio_86B20B25D2FD6BB23D9D3C31C5DAA761" 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_86B20B25D2FD6BB23D9D3C31C5DAA761_documentation_en-US" xlink:label="lab_trs_NetLeverageRatio_86B20B25D2FD6BB23D9D3C31C5DAA761" 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-20191231.xsd#trs_NetLeverageRatio" xlink:label="loc_trs_NetLeverageRatio_86B20B25D2FD6BB23D9D3C31C5DAA761" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_EA8049231B5E603E2A253C31C5DA5E40_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_EA8049231B5E603E2A253C31C5DA5E40" 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_EA8049231B5E603E2A253C31C5DA5E40_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_EA8049231B5E603E2A253C31C5DA5E40" 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_EA8049231B5E603E2A253C31C5DA5E40" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCredit_880FE48E718E25B261E63C31C5DBF330_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_880FE48E718E25B261E63C31C5DBF330" 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_880FE48E718E25B261E63C31C5DBF330_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_880FE48E718E25B261E63C31C5DBF330" 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:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_85B7869C4431174C77AA7DD22A350C9A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_85B7869C4431174C77AA7DD22A350C9A" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_85B7869C4431174C77AA7DD22A350C9A" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_77D6244C49C1CA4826A57DD22A353850" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_7796B505BAE92E4F89557DD22A3581BC" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_B5D55E11AB8C20FFD4C07DD22A36B0C3" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan1Member_51A0D808FCF2E89F86D664193E523475" xlink:to="lab_trs_Plan1Member_51A0D808FCF2E89F86D664193E523475" xlink:type="arc" />
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    <link:label id="lab_trs_Plan2Member_E871615AC84C3FC8572164193E52C06C_label_en-US" xlink:label="lab_trs_Plan2Member_E871615AC84C3FC8572164193E52C06C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 2 [Member]</link:label>
    <link:label id="lab_trs_Plan2Member_E871615AC84C3FC8572164193E52C06C_documentation_en-US" xlink:label="lab_trs_Plan2Member_E871615AC84C3FC8572164193E52C06C" 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-20191231.xsd#trs_Plan2Member" xlink:label="loc_trs_Plan2Member_E871615AC84C3FC8572164193E52C06C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan2Member_E871615AC84C3FC8572164193E52C06C" xlink:to="lab_trs_Plan2Member_E871615AC84C3FC8572164193E52C06C" xlink:type="arc" />
    <link:label id="lab_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A_terseLabel_en-US" xlink:label="lab_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 3 [Member]</link:label>
    <link:label id="lab_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A_label_en-US" xlink:label="lab_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 3 [Member]</link:label>
    <link:label id="lab_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A_documentation_en-US" xlink:label="lab_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A" 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-20191231.xsd#trs_Plan3Member" xlink:label="loc_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A" xlink:to="lab_trs_Plan3Member_6DB90A2B69DAD280286964193E526C0A" xlink:type="arc" />
    <link:label id="lab_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE_terseLabel_en-US" xlink:label="lab_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 4 [Member]</link:label>
    <link:label id="lab_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE_label_en-US" xlink:label="lab_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 4 [Member]</link:label>
    <link:label id="lab_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE_documentation_en-US" xlink:label="lab_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE" 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-20191231.xsd#trs_Plan4Member" xlink:label="loc_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE" xlink:to="lab_trs_Plan4Member_1BB68918CE26C50D603664193E5229DE" xlink:type="arc" />
    <link:label id="lab_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED_terseLabel_en-US" xlink:label="lab_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 5 [Member]</link:label>
    <link:label id="lab_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED_label_en-US" xlink:label="lab_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED" 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_7708BDC292F1BA93912F64193E52CCED_documentation_en-US" xlink:label="lab_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED" 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-20191231.xsd#trs_Plan5Member" xlink:label="loc_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED" xlink:to="lab_trs_Plan5Member_7708BDC292F1BA93912F64193E52CCED" xlink:type="arc" />
    <link:label id="lab_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC_terseLabel_en-US" xlink:label="lab_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 6 [Member]</link:label>
    <link:label id="lab_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC_label_en-US" xlink:label="lab_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 6 [Member]</link:label>
    <link:label id="lab_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC_documentation_en-US" xlink:label="lab_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC" 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-20191231.xsd#trs_Plan6Member" xlink:label="loc_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC" xlink:to="lab_trs_Plan6Member_41D337DD622B05719C2964193E53BDDC" xlink:type="arc" />
    <link:label id="lab_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521_terseLabel_en-US" xlink:label="lab_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service-based restriced shares [Member]</link:label>
    <link:label id="lab_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521_label_en-US" xlink:label="lab_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Service-based restriced shares [Member]</link:label>
    <link:label id="lab_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521_documentation_en-US" xlink:label="lab_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Shares that an entity has not yet issued because the agreed-upon consideration, emplooyee services, has not yet been received</link:label>
    <link:loc xlink:href="trs-20191231.xsd#trs_ServiceBasedRestricedSharesMember" xlink:label="loc_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521" xlink:to="lab_trs_ServiceBasedRestricedSharesMember_74283C13F865769E370C64193E534521" xlink:type="arc" />
    <link:label id="lab_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390_terseLabel_en-US" xlink:label="lab_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance-based restriced shares [Member]</link:label>
    <link:label id="lab_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390_label_en-US" xlink:label="lab_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance-based restriced shares [Member]</link:label>
    <link:label id="lab_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390_documentation_en-US" xlink:label="lab_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Performance-based restriced shares award.</link:label>
    <link:loc xlink:href="trs-20191231.xsd#trs_PerformanceBasedRestricedSharesMember" xlink:label="loc_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390" xlink:to="lab_trs_PerformanceBasedRestricedSharesMember_7D9D6FF2D9EF454AC4EC64193E54A390" xlink:type="arc" />
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    <link:label id="lab_srt_TitleOfIndividualAxis_667D20FE760F643C706C64193E54A56A_label_en-US" xlink:label="lab_srt_TitleOfIndividualAxis_667D20FE760F643C706C64193E54A56A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of Individual [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srt_TitleOfIndividualAxis_667D20FE760F643C706C64193E54A56A" xlink:type="locator" />
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    <link:label id="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_5D2F0BE4F31176020B4F64193E54F527_terseLabel_en-US" xlink:label="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_5D2F0BE4F31176020B4F64193E54F527" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title of Individual with Relationship to Entity [Domain]</link:label>
    <link:label id="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_5D2F0BE4F31176020B4F64193E54F527_label_en-US" xlink:label="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_5D2F0BE4F31176020B4F64193E54F527" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of Individual [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_5D2F0BE4F31176020B4F64193E54F527" xlink:type="locator" />
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    <link:label id="lab_srt_DirectorMember_01F4F46282C61D56445164193E54AAC2_terseLabel_en-US" xlink:label="lab_srt_DirectorMember_01F4F46282C61D56445164193E54AAC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-employee independent director [Member]</link:label>
    <link:label id="lab_srt_DirectorMember_01F4F46282C61D56445164193E54AAC2_label_en-US" xlink:label="lab_srt_DirectorMember_01F4F46282C61D56445164193E54AAC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Director [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_DirectorMember" xlink:label="loc_srt_DirectorMember_01F4F46282C61D56445164193E54AAC2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_CCC9E6AFC848D71B24A064193E55EE80_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_CCC9E6AFC848D71B24A064193E55EE80" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award requisite service period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_CCC9E6AFC848D71B24A064193E55EE80_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_CCC9E6AFC848D71B24A064193E55EE80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_CCC9E6AFC848D71B24A064193E55EE80" xlink:type="locator" />
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    <link:label id="lab_trs_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformancePeriodComplete_D56798EB659A07CC58CA64193E553443_terseLabel_en-US" xlink:label="lab_trs_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformancePeriodComplete_D56798EB659A07CC58CA64193E553443" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Performance Period Complete</link:label>
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    <link:loc xlink:href="trs-20191231.xsd#trs_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformancePeriodComplete" xlink:label="loc_trs_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformancePeriodComplete_D56798EB659A07CC58CA64193E553443" xlink:type="locator" />
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    <link:label id="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveCompensationPlanThresholdTargetAwardForGrantingStockAward_F5F90BFCCB4C25F5337664193E558B20_terseLabel_en-US" xlink:label="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveCompensationPlanThresholdTargetAwardForGrantingStockAward_F5F90BFCCB4C25F5337664193E558B20" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ICP, Threshold target for granting stock awards</link:label>
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    <link:loc xlink:href="trs-20191231.xsd#trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveCompensationPlanThresholdTargetAwardForGrantingStockAward" xlink:label="loc_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveCompensationPlanThresholdTargetAwardForGrantingStockAward_F5F90BFCCB4C25F5337664193E558B20" xlink:type="locator" />
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    <link:label id="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B_terseLabel_en-US" xlink:label="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of shares earned % of target award</link:label>
    <link:label id="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B_label_en-US" xlink:label="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award</link:label>
    <link:label id="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B_documentation_en-US" xlink:label="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of shares earned as a % of target award.</link:label>
    <link:loc xlink:href="trs-20191231.xsd#trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward" xlink:label="loc_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B" xlink:to="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmountOfSharesEarnedOfTargetAward_C80BFA3DFA37EA56ED4E64193E568F0B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued_282B069403C5DD9A9CAD64193E57EC00_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued_282B069403C5DD9A9CAD64193E57EC00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted shares issued related to director fee deferrals</link:label>
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    <link:label id="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedMetricEarningsPerShare_259EFB5181818A0D72F064193E579584_verboseLabel_en-US" xlink:label="lab_trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedMetricEarningsPerShare_259EFB5181818A0D72F064193E579584" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cumulative Earnings Per Share</link:label>
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