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    <link:label id="lab_us-gaap_LetterOfCreditMember_C3087608E89D558BE215A577642AD0A2_terseLabel_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_7CA7901ECA685174803794811B321B83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit [Member]</link:label>
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    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_988D079FD57EB4A00605A577642A487D_terseLabel_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_4E6128885920583CA873D4DC1F055C3C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">U.S. bank debt and receivables facility [Member]</link:label>
    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_988D079FD57EB4A00605A577642A487D_label_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_4E6128885920583CA873D4DC1F055C3C" 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_988D079FD57EB4A00605A577642A487D_documentation_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_4E6128885920583CA873D4DC1F055C3C" 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>
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    <link:label id="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_1BAB9A89024572712AC0A577642A22DD_terseLabel_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_9A9E55C9FC0E565186DDEBF6B225008F" 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_1BAB9A89024572712AC0A577642A22DD_label_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_9A9E55C9FC0E565186DDEBF6B225008F" 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_1BAB9A89024572712AC0A577642A22DD_documentation_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_9A9E55C9FC0E565186DDEBF6B225008F" 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-20170630.xsd#trs_RevolvingCreditAndTermLoanFacilitiesMember" xlink:label="loc_trs_RevolvingCreditAndTermLoanFacilitiesMember_9A9E55C9FC0E565186DDEBF6B225008F" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_5E1CB7D3353E5262BF333DCA48BA3A6A" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsOfFinancingCosts" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_B94855A8C857544C9CF0F226BC6F2485" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_4BFD3C9C8D545A70AF064FF03A8B8A2D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EFAEA120CA3EC9694E71A577642A76C5_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EBE7F1A05C6D58A5B626203F5021B046" 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>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_EBE7F1A05C6D58A5B626203F5021B046" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_7132F7D7926A6661B488A577642A0D1B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_608F4DFCB3F95075A9659ACF921D4079" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Maturity Date</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_7132F7D7926A6661B488A577642A0D1B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_608F4DFCB3F95075A9659ACF921D4079" 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_DebtInstrumentFaceAmount_3E38FE6F2CD54DC3F6E6A577642A2318_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_08051841984F517EAFBCC272FC011703" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
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    <link:label id="lab_trs_NetLeverageRatio_15035D8FC73DCFC9F470A577642A8003_documentation_en-US" xlink:label="lab_trs_NetLeverageRatio_D7E36AD66B0550999BDAF0E9FD3A4802" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net leverage ratio, as defined</link:label>
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    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_A437A365BCFF3DE1F664A577642AB9C3_documentation_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_39C0A9DA8A435FE9AAEE0F4245888F4D" 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>
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    <link:label id="lab_us-gaap_LineOfCredit_D61E2A1DC72B5EB0C3A2A577642AD6D7_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_D9721CBCB85152638DE5C2789A7C6FD1" 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_F68C2FCAEF3165714552A577642A89A0_documentation_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_DC2A70DC360055C88CF452ECD33C39D1" 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_ProceedsFromLinesOfCredit_3A8E2F60FEF9E2910F477A9688B7C2D3_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_3A8E2F60FEF9E2910F477A9688B7C2D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings on revolving credit and accounts receivable facilities</link:label>
    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_3A8E2F60FEF9E2910F477A9688B7C2D3_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_3A8E2F60FEF9E2910F477A9688B7C2D3" 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:label id="lab_us-gaap_RepaymentsOfLinesOfCredit_C5611FA407E10EEB2BC27A9688B77DAF_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLinesOfCredit_C5611FA407E10EEB2BC27A9688B77DAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Lines of Credit</link:label>
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    <link:label id="lab_trs_DeferredPurchasePriceAmountPaidthru2016_B69F2CCFCEF345F1A00A7A9688B9E56B_terseLabel_en-US" xlink:label="lab_trs_DeferredPurchasePriceAmountPaidthru2016_B69F2CCFCEF345F1A00A7A9688B9E56B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments for deferred purchase price</link:label>
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    <link:label id="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_269F5131669E8A80B91E7A9688B9AD3F_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_269F5131669E8A80B91E7A9688B9AD3F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Debt financing fees</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_269F5131669E8A80B91E7A9688B9AD3F_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_269F5131669E8A80B91E7A9688B9AD3F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Debt Extinguishment Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsOfDebtExtinguishmentCosts" xlink:label="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_269F5131669E8A80B91E7A9688B9AD3F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_4AABD0B9A35C1B91ADC77A9688B998C1_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_4AABD0B9A35C1B91ADC77A9688B998C1" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Shares surrendered upon options and restricted stock vesting to cover taxes</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_AA266CB4F469399164417A9688B9F6E9_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_AA266CB4F469399164417A9688B9F6E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from exercise of stock options</link:label>
    <link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_AA266CB4F469399164417A9688B9F6E9_label_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_AA266CB4F469399164417A9688B9F6E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Stock Options Exercised</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4726946EC87A7F4FD42E7A9688B9AD17_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4726946EC87A7F4FD42E7A9688B9AD17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other financing activities</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_B961EDE7E7B560DC25B87A9688BA9972_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_B961EDE7E7B560DC25B87A9688BA9972" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net increase for the period</link:label>
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    <link:label id="lab_trs_Plan1Member_F18456D46C18F66FB0EE7582CC0D434B_label_en-US" xlink:label="lab_trs_Plan1Member_F18456D46C18F66FB0EE7582CC0D434B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 1 [Member]</link:label>
    <link:label id="lab_trs_Plan1Member_F18456D46C18F66FB0EE7582CC0D434B_documentation_en-US" xlink:label="lab_trs_Plan1Member_F18456D46C18F66FB0EE7582CC0D434B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
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    <link:loc xlink:href="trs-20170630.xsd#trs_Plan2Member" xlink:label="loc_trs_Plan2Member_5296C8FFA31D46590CB77582CC0D1F06" xlink:type="locator" />
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    <link:label id="lab_trs_Plan3Member_EE6077C5ABC3574A1C747582CC0D6670_label_en-US" xlink:label="lab_trs_Plan3Member_EE6077C5ABC3574A1C747582CC0D6670" 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_EE6077C5ABC3574A1C747582CC0D6670_documentation_en-US" xlink:label="lab_trs_Plan3Member_EE6077C5ABC3574A1C747582CC0D6670" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
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    <link:label id="lab_trs_Plan4Member_53C2F9C788C68C3AAC8A7582CC0D867B_documentation_en-US" xlink:label="lab_trs_Plan4Member_53C2F9C788C68C3AAC8A7582CC0D867B" 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-20170630.xsd#trs_Plan4Member" xlink:label="loc_trs_Plan4Member_53C2F9C788C68C3AAC8A7582CC0D867B" xlink:type="locator" />
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    <link:label id="lab_trs_Plan5Member_6F18BFEC982C4BCEDAF17582CC0D1339_terseLabel_en-US" xlink:label="lab_trs_Plan5Member_6F18BFEC982C4BCEDAF17582CC0D1339" 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_6F18BFEC982C4BCEDAF17582CC0D1339_label_en-US" xlink:label="lab_trs_Plan5Member_6F18BFEC982C4BCEDAF17582CC0D1339" 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_6F18BFEC982C4BCEDAF17582CC0D1339_documentation_en-US" xlink:label="lab_trs_Plan5Member_6F18BFEC982C4BCEDAF17582CC0D1339" 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-20170630.xsd#trs_Plan5Member" xlink:label="loc_trs_Plan5Member_6F18BFEC982C4BCEDAF17582CC0D1339" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan5Member_6F18BFEC982C4BCEDAF17582CC0D1339" xlink:to="lab_trs_Plan5Member_6F18BFEC982C4BCEDAF17582CC0D1339" xlink:type="arc" />
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    <link:label id="lab_trs_Plan7Member_75D4AE5CC95FC0CBDBDA7582CC0DF06F_label_en-US" xlink:label="lab_trs_Plan7Member_75D4AE5CC95FC0CBDBDA7582CC0DF06F" 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_75D4AE5CC95FC0CBDBDA7582CC0DF06F_documentation_en-US" xlink:label="lab_trs_Plan7Member_75D4AE5CC95FC0CBDBDA7582CC0DF06F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Plan 7 [Member]</link:label>
    <link:loc xlink:href="trs-20170630.xsd#trs_Plan7Member" xlink:label="loc_trs_Plan7Member_75D4AE5CC95FC0CBDBDA7582CC0DF06F" xlink:type="locator" />
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    <link:label id="lab_trs_Plan8Member_22400A1D31E009D93DE27582CC0D58B5_terseLabel_en-US" xlink:label="lab_trs_Plan8Member_22400A1D31E009D93DE27582CC0D58B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 8 [Member]</link:label>
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