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  <xs:element name="Note4MajorCustomersDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="intt_Note4MajorCustomersDetailsTable"/>
  <xs:element name="Note4MajorCustomersDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_Note4MajorCustomersDetailsLineItems"/>
  <xs:element name="Note8EquipmentLeasingDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="intt_Note8EquipmentLeasingDetailsTable"/>
  <xs:element name="Note8EquipmentLeasingDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_Note8EquipmentLeasingDetailsLineItems"/>
  <xs:element name="Note12StockbasedCompensationPlanDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="intt_Note12StockbasedCompensationPlanDetailsTable"/>
  <xs:element name="Note12StockbasedCompensationPlanDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_Note12StockbasedCompensationPlanDetailsLineItems"/>
  <xs:element name="DefinedContributionPlanMaximumAnnualEmployerMatchingContributionPerEmplyeeAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="intt_DefinedContributionPlanMaximumAnnualEmployerMatchingContributionPerEmplyeeAmount"/>
  <xs:element name="DefinedContributionPlanEmployerMatchingContributionVestingPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_DefinedContributionPlanEmployerMatchingContributionVestingPeriod"/>
  <xs:element name="AssetMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_AssetMember"/>
  <xs:element name="CarryingValueChangesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_CarryingValueChangesMember"/>
  <xs:element name="ElectricalProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_ElectricalProductsMember"/>
  <xs:element name="ForeignMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_ForeignMember"/>
  <xs:element name="HakutoCoLtdMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_HakutoCoLtdMember"/>
  <xs:element name="MansfieldMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_MansfieldMember"/>
  <xs:element name="MechanicalProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_MechanicalProductsMember"/>
  <xs:element name="MtLaurelMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_MtLaurelMember"/>
  <xs:element name="SigmaMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_SigmaMember"/>
  <xs:element name="StockPlan2007Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_StockPlan2007Member"/>
  <xs:element name="StockPlan2014Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_StockPlan2014Member"/>
  <xs:element name="TexasInstrumentsIncorporatedMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_TexasInstrumentsIncorporatedMember"/>
  <xs:element name="ThermalProductsAndMechanicalProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_ThermalProductsAndMechanicalProductsMember"/>
  <xs:element name="ThermalProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_ThermalProductsMember"/>
  <xs:element name="ThermonicsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_ThermonicsMember"/>
  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="intt_DocumentAndEntityInformationAbstract"/>
</xs:schema>
