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| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="us-gaap_LineOfCreditFacilityAxis_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentTable_637626285376782777" xlink:to="us-gaap_LineOfCreditFacilityAxis_637626285376793038" order="4" use="optional" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LineOfCreditFacilityAxis_637626285376793038" xlink:to="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_UsBankMember" xlink:label="sgma_UsBankMember_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038" xlink:to="sgma_UsBankMember_637626285376793038" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_JpmorganChaseBankMember" xlink:label="sgma_JpmorganChaseBankMember_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038" xlink:to="sgma_JpmorganChaseBankMember_637626285376793038" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_ChinaConstructionBankMember" xlink:label="sgma_ChinaConstructionBankMember_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038" xlink:to="sgma_ChinaConstructionBankMember_637626285376793038" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_BankAndTrustSsbMember" xlink:label="sgma_BankAndTrustSsbMember_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038" xlink:to="sgma_BankAndTrustSsbMember_637626285376793038" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_EngencapFinS.a.DeC.v.Member" xlink:label="sgma_EngencapFinS.a.DeC.v.Member_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038" xlink:to="sgma_EngencapFinS.a.DeC.v.Member_637626285376793038" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_FgiEquipmentFinanceLlcMember" xlink:label="sgma_FgiEquipmentFinanceLlcMember_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain_637626285376793038" xlink:to="sgma_FgiEquipmentFinanceLlcMember_637626285376793038" order="6" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentTable_637626285376782777" xlink:to="us-gaap_CreditFacilityAxis_637626285376793038" order="5" use="optional" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_CreditFacilityAxis_637626285376793038" xlink:to="us-gaap_CreditFacilityDomain_637626285376793038" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_RevolvingLineCapMember" xlink:label="sgma_RevolvingLineCapMember_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_CreditFacilityDomain_637626285376793038" xlink:to="sgma_RevolvingLineCapMember_637626285376793038" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="us-gaap_SecuredDebtMember_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_CreditFacilityDomain_637626285376793038" xlink:to="us-gaap_SecuredDebtMember_637626285376793038" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="3"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentTable_637626285376782777" xlink:to="us-gaap_LongtermDebtTypeAxis_637626285376793038" order="6" use="optional" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain_637626285376793038"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeAxis_637626285376793038" xlink:to="us-gaap_LongtermDebtTypeDomain_637626285376793038" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesPayableToBanksMember" xlink:label="us-gaap_NotesPayableToBanksMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeDomain_637626285376793038" xlink:to="us-gaap_NotesPayableToBanksMember_637626285376802988" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_NotesPayableToBuildingsMember" xlink:label="sgma_NotesPayableToBuildingsMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeDomain_637626285376793038" xlink:to="sgma_NotesPayableToBuildingsMember_637626285376802988" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_NotesPayableToEquipmentMember" xlink:label="sgma_NotesPayableToEquipmentMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeDomain_637626285376793038" xlink:to="sgma_NotesPayableToEquipmentMember_637626285376802988" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_CapitalLeaseObligationsAndSaleLeasebackAgreementsMember" xlink:label="sgma_CapitalLeaseObligationsAndSaleLeasebackAgreementsMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeDomain_637626285376793038" xlink:to="sgma_CapitalLeaseObligationsAndSaleLeasebackAgreementsMember_637626285376802988" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_PaycheckProtectionProgramMember" xlink:label="sgma_PaycheckProtectionProgramMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeDomain_637626285376793038" xlink:to="sgma_PaycheckProtectionProgramMember_637626285376802988" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentTable_637626285376782777" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis_637626285376802988" order="7" use="optional" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis_637626285376802988" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain_637626285376802988" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_CorporateHeadquartersAndManufacturingFacilityMember" xlink:label="sgma_CorporateHeadquartersAndManufacturingFacilityMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain_637626285376802988" xlink:to="sgma_CorporateHeadquartersAndManufacturingFacilityMember_637626285376802988" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_EngineeringAndDesignCenterMember" xlink:label="sgma_EngineeringAndDesignCenterMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain_637626285376802988" xlink:to="sgma_EngineeringAndDesignCenterMember_637626285376802988" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_WarehousingAndDistributionCenterMember" xlink:label="sgma_WarehousingAndDistributionCenterMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain_637626285376802988" xlink:to="sgma_WarehousingAndDistributionCenterMember_637626285376802988" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquipmentMember" xlink:label="us-gaap_EquipmentMember_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain_637626285376802988" xlink:to="us-gaap_EquipmentMember_637626285376802988" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis_637626285376802988"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentTable_637626285376782777" xlink:to="srt_StatementScenarioAxis_637626285376802988" order="8" use="optional" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="srt_ScenarioUnspecifiedDomain_637626285376812962"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_StatementScenarioAxis_637626285376802988" xlink:to="srt_ScenarioUnspecifiedDomain_637626285376812962" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_SeniorityPremiumsMember" xlink:label="sgma_SeniorityPremiumsMember_637626285376812962"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ScenarioUnspecifiedDomain_637626285376812962" xlink:to="sgma_SeniorityPremiumsMember_637626285376812962" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="sgma-20210430.xsd#sgma_RetirementAccountsMember" xlink:label="sgma_RetirementAccountsMember_637626285376812962"> </loc> |
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| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems_637626285376812962"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentTable_637626285376782777" xlink:to="us-gaap_DebtInstrumentLineItems_637626285376812962" order="9" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" priority="4"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_637626285376812962"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentLineItems_637626285376812962" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_637626285376812962" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="us-gaap_DebtInstrumentFaceAmount_637626285376812962"> </loc> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentLineItems_637626285376812962" xlink:to="us-gaap_DebtInstrumentFaceAmount_637626285376812962" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="8"> </presentationArc> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationDate1" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1_637626285376812962"> </loc> |
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