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	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_MaintenanceAndOtherInventoryNet' name='MaintenanceAndOtherInventoryNet'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='credit' id='fil_MaintenanceAndOtherInventoryAllowanceForObsolescence' name='MaintenanceAndOtherInventoryAllowanceForObsolescence'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' xbrli:balance='credit' id='fil_InventoryDisposedOf' name='InventoryDisposedOf'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' xbrli:balance='debit' id='fil_ProvisionForPotentialInventoryObsolescence' name='ProvisionForPotentialInventoryObsolescence'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='credit' id='fil_OutstandingChecks' name='OutstandingChecks'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_CustomerDepositsMember' name='CustomerDepositsMember'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_PersonnelCostsMember' name='PersonnelCostsMember'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_OtherMember' name='OtherMember'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_StructuralMember' name='StructuralMember'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_AerospaceDefenseMember' name='AerospaceDefenseMember'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_IndustrialMember' name='IndustrialMember'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_AllowanceForDoubtfulReceivables' name='AllowanceForDoubtfulReceivables'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_TaxInventoryAdjustment' name='TaxInventoryAdjustment'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_AllowanceForObsoleteInventory' name='AllowanceForObsoleteInventory'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_AccruedVacation' name='AccruedVacation'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_WarrantyReserve' name='WarrantyReserve'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_RDCapitalization' name='RDCapitalization'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_StockOptionsIssuedForServices' name='StockOptionsIssuedForServices'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='credit' id='fil_ExcessTaxDepreciation' name='ExcessTaxDepreciation'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' xbrli:balance='debit' id='fil_OtherAdjustments' name='OtherAdjustments'/>
	<element nillable='true' type='xbrli:sharesItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_AverageCommonSharesOutstanding' name='AverageCommonSharesOutstanding'/>
	<element nillable='true' type='xbrli:sharesItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_CommonSharesIssuableUnderStockOptionPlans' name='CommonSharesIssuableUnderStockOptionPlans'/>
	<element nillable='true' type='xbrli:sharesItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_AverageCommonSharesOutstandingAssumingDilution' name='AverageCommonSharesOutstandingAssumingDilution'/>
	<element nillable='true' type='xbrli:sharesItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_CommonSharesIssuedToEmployees' name='CommonSharesIssuedToEmployees'/>
	<element nillable='true' type='xbrli:sharesItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' id='fil_SharesReservedForFurtherIssue' name='SharesReservedForFurtherIssue'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N90110001Member' name='N90110001Member'/>
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	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N110112001Member' name='N110112001Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N120113001Member' name='N120113001Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N130114001Member' name='N130114001Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N160117001Member' name='N160117001Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N190120001Member' name='N190120001Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N20012100Member' name='N20012100Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N46014700Member' name='N46014700Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N9014700Member' name='N9014700Member'/>
	<element nillable='true' type='xbrli:stringItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_LossContingencyInestimableLoss2' name='LossContingencyInestimableLoss2'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N30013100Member' name='N30013100Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N43014400Member' name='N43014400Member'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' xbrli:balance='debit' id='fil_StockOptionCosts' name='StockOptionCosts'/>
	<element nillable='true' type='xbrli:monetaryItemType' substitutionGroup='xbrli:item' xbrli:periodType='instant' xbrli:balance='debit' id='fil_AccruedProfessionalFees' name='AccruedProfessionalFees'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N56015700Member' name='N56015700Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_N9015700Member' name='N9015700Member'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_NewYorkMember' name='NewYorkMember'/>
	<element abstract='true' nillable='true' type='dtr-types:domainItemType' substitutionGroup='xbrli:item' xbrli:periodType='duration' id='fil_CaliforniaMember' name='CaliforniaMember'/>
</schema>
