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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_A90E311BF7C9CAD54E2F8630C56E62A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_A90E311BF7C9CAD54E2F8630C56E62A3" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_A90E311BF7C9CAD54E2F8630C56E62A3" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_2E451CE32BAAFACE4B788630C56EC6FA_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_2E451CE32BAAFACE4B788630C56EC6FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan (3,179 and 3,744 shares for nine month period ended March 31, 2013 and 2012, respectively)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_2E451CE32BAAFACE4B788630C56EC6FA_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_2E451CE32BAAFACE4B788630C56EC6FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Employee Stock Purchase Plan</link:label>
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    <link:label id="lab_us-gaap_TreasuryStockValueAcquiredCostMethod_454D860B8F93506C2B958630C56E255D_negatedLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockValueAcquiredCostMethod_454D860B8F93506C2B958630C56E255D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Open market purchase of treasury shares (886,503 shares)</link:label>
    <link:label id="lab_us-gaap_TreasuryStockValueAcquiredCostMethod_454D860B8F93506C2B958630C56E255D_label_en-US" xlink:label="lab_us-gaap_TreasuryStockValueAcquiredCostMethod_454D860B8F93506C2B958630C56E255D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock, Value, Acquired, Cost Method</link:label>
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    <link:label id="lab_mtrx_OtherTreasurySharePurchases_438445C2F28AAF496F028630C56E96C8_negatedLabel_en-US" xlink:label="lab_mtrx_OtherTreasurySharePurchases_438445C2F28AAF496F028630C56E96C8" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other treasury share purchases (102,376 and 48,810 shares for nine month period ended March 31, 2013 and 2012, respectively)</link:label>
    <link:label id="lab_mtrx_OtherTreasurySharePurchases_438445C2F28AAF496F028630C56E96C8_label_en-US" xlink:label="lab_mtrx_OtherTreasurySharePurchases_438445C2F28AAF496F028630C56E96C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Treasury Share Purchases</link:label>
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    <link:loc xlink:href="mtrx-20130331.xsd#mtrx_OtherTreasurySharePurchases" xlink:label="loc_mtrx_OtherTreasurySharePurchases_438445C2F28AAF496F028630C56E96C8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_2A67292C4028ED9DFF418630C56E168E_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_2A67292C4028ED9DFF418630C56E168E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_2A67292C4028ED9DFF418630C56E168E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockholdersEquity_6C2C97CFDD881B6EFBB38630C56E6D31_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_6C2C97CFDD881B6EFBB38630C56E6D31" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balances, ending</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_6C2C97CFDD881B6EFBB38630C56E6D31" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessCombinationsAbstract_AB68AA0E190B4003D079F890354C7257_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationsAbstract_AB68AA0E190B4003D079F890354C7257" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combinations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_AB68AA0E190B4003D079F890354C7257" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_FE999F030E49FF08D69CF890354CD0B4_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_FE999F030E49FF08D69CF890354CD0B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Preliminary Purchase Price Allocation</link:label>
    <link:label id="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_FE999F030E49FF08D69CF890354CD0B4_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_FE999F030E49FF08D69CF890354CD0B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_FE999F030E49FF08D69CF890354CD0B4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtDisclosureAbstract_613A42A6C30C2F3C1BC9807FADC79F5C_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_613A42A6C30C2F3C1BC9807FADC79F5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_613A42A6C30C2F3C1BC9807FADC79F5C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2B68C232251607B4AECD807FADC75447_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2B68C232251607B4AECD807FADC75447" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior credit facility</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2B68C232251607B4AECD807FADC75447_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2B68C232251607B4AECD807FADC75447" 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/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2B68C232251607B4AECD807FADC75447" xlink:type="locator" />
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    <link:label id="lab_mtrx_CapacityConstraintDueToSeniorLeverageRatio_134E90650A6B7B433661807FADC775A2_terseLabel_en-US" xlink:label="lab_mtrx_CapacityConstraintDueToSeniorLeverageRatio_134E90650A6B7B433661807FADC775A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capacity constraint due to the Senior Leverage Ratio</link:label>
    <link:label id="lab_mtrx_CapacityConstraintDueToSeniorLeverageRatio_134E90650A6B7B433661807FADC775A2_label_en-US" xlink:label="lab_mtrx_CapacityConstraintDueToSeniorLeverageRatio_134E90650A6B7B433661807FADC775A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capacity Constraint Due To Senior Leverage Ratio</link:label>
    <link:label id="lab_mtrx_CapacityConstraintDueToSeniorLeverageRatio_134E90650A6B7B433661807FADC775A2_documentation_en-US" xlink:label="lab_mtrx_CapacityConstraintDueToSeniorLeverageRatio_134E90650A6B7B433661807FADC775A2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capacity constraint due to the Senior Leverage Ratio.</link:label>
    <link:loc xlink:href="mtrx-20130331.xsd#mtrx_CapacityConstraintDueToSeniorLeverageRatio" xlink:label="loc_mtrx_CapacityConstraintDueToSeniorLeverageRatio_134E90650A6B7B433661807FADC775A2" xlink:type="locator" />
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    <link:label id="lab_mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint_FFA51451A0778CAB5EE9807FADC78529_totalLabel_en-US" xlink:label="lab_mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint_FFA51451A0778CAB5EE9807FADC78529" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Capacity under the credit facility</link:label>
    <link:label id="lab_mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint_FFA51451A0778CAB5EE9807FADC78529_label_en-US" xlink:label="lab_mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint_FFA51451A0778CAB5EE9807FADC78529" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint</link:label>
    <link:label id="lab_mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint_FFA51451A0778CAB5EE9807FADC78529_documentation_en-US" xlink:label="lab_mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint_FFA51451A0778CAB5EE9807FADC78529" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of credit facility maximum borrowing capacity after consideration of capacity constraint.</link:label>
    <link:loc xlink:href="mtrx-20130331.xsd#mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint" xlink:label="loc_mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint_FFA51451A0778CAB5EE9807FADC78529" xlink:type="locator" />
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    <link:label id="lab_mtrx_LettersOfCreditSubjectToCreditFacility_5C4F4731D4D622959135807FADC8C5A1_terseLabel_en-US" xlink:label="lab_mtrx_LettersOfCreditSubjectToCreditFacility_5C4F4731D4D622959135807FADC8C5A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit subject to the credit facility</link:label>
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    <link:label id="lab_mtrx_LettersOfCreditSubjectToCreditFacility_5C4F4731D4D622959135807FADC8C5A1_documentation_en-US" xlink:label="lab_mtrx_LettersOfCreditSubjectToCreditFacility_5C4F4731D4D622959135807FADC8C5A1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Letters Of Credit Subject To Credit Facility.</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_C343A7A639B3145F0F7C807FADC8CEA1_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_C343A7A639B3145F0F7C807FADC8CEA1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Availability under the senior credit facility</link:label>
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    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_08B94620B8EACECE309E84E0EAD7A41E_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_08B94620B8EACECE309E84E0EAD7A41E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Office equipment and software</link:label>
    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_08B94620B8EACECE309E84E0EAD7A41E_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_08B94620B8EACECE309E84E0EAD7A41E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Furniture and Fixtures, Gross</link:label>
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    <link:label id="lab_us-gaap_ConstructionInProgressGross_E92F192B37E5A82711ED84E0EAD7769D_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_E92F192B37E5A82711ED84E0EAD7769D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction in progress</link:label>
    <link:label id="lab_us-gaap_ConstructionInProgressGross_E92F192B37E5A82711ED84E0EAD7769D_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_E92F192B37E5A82711ED84E0EAD7769D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction in Progress, Gross</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_4BF896034594F211703D84E0EAD7EDDE_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_4BF896034594F211703D84E0EAD7EDDE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment at cost, gross</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_4BF896034594F211703D84E0EAD7EDDE_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_4BF896034594F211703D84E0EAD7EDDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_9C1E2F51931AE233491A84E0EAD744BF_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_9C1E2F51931AE233491A84E0EAD744BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
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    <link:label id="lab_us-gaap_Goodwill_DBEB26C3697D4F83DB7B84E0EAD7EE7B_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_DBEB26C3697D4F83DB7B84E0EAD7EE7B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_us-gaap_Goodwill_DBEB26C3697D4F83DB7B84E0EAD7EE7B_label_en-US" xlink:label="lab_us-gaap_Goodwill_DBEB26C3697D4F83DB7B84E0EAD7EE7B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_DBEB26C3697D4F83DB7B84E0EAD7EE7B" xlink:to="lab_us-gaap_Goodwill_DBEB26C3697D4F83DB7B84E0EAD7EE7B" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_3CDAE38A3E424692C03B84E0EAD7AAA4_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_3CDAE38A3E424692C03B84E0EAD7AAA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other intangible assets</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_5C1607F13FE64A9ACE778606D148E906_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_5C1607F13FE64A9ACE778606D148E906" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Inventories</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_C7ECF14B771535E8887F8606D1489984" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings_C54E84D7689A9F7DF8798606D148C979_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings_C54E84D7689A9F7DF8798606D148C979" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Billings on uncompleted contracts in excess of costs and estimated earnings</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings" xlink:label="loc_us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings_C54E84D7689A9F7DF8798606D148C979" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_209DBC7D1271BAD0025F8606D14882D6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BA9DEA8A8C162505BBF68606D148CDE7_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BA9DEA8A8C162505BBF68606D148CDE7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided (used) by operating activities</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareBasic_103628B7B7A3DD75CF35F8903526AA8E_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_103628B7B7A3DD75CF35F8903526AA8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareDiluted_0925F6146DC84E1820BCF890352767A3_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_0925F6146DC84E1820BCF890352767A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted</link:label>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_E54566F6B07FE0AFC163F8903527D2B1_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_E54566F6B07FE0AFC163F8903527D2B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average common shares outstanding:</link:label>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_BDA2EBE82D2EBBEA8181F8903527A7AD_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_BDA2EBE82D2EBBEA8181F8903527A7AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic (shares)</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_BDA2EBE82D2EBBEA8181F8903527A7AD_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_BDA2EBE82D2EBBEA8181F8903527A7AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_18D41412F2D89CD91A0DF8903527C5F4_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_18D41412F2D89CD91A0DF8903527C5F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Diluted (shares)</link:label>
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    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_A3AA59D7C8C488F60977F89034EF11A1_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_A3AA59D7C8C488F60977F89034EF11A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible Assets Including Goodwill</link:label>
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    <link:label id="lab_mtrx_UncompletedContractsCostsIncurredAndEstimatedEarningsRecognized_CA9C18798F597BA2529EF890353E1CE7_terseLabel_en-US" xlink:label="lab_mtrx_UncompletedContractsCostsIncurredAndEstimatedEarningsRecognized_CA9C18798F597BA2529EF890353E1CE7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Costs incurred and estimated earnings recognized on uncompleted contracts</link:label>
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