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    <link:label id="lab_teso_LineOfCreditFacilitySwingLineLoansCurrentBorrowingCapacity_571F169B46D372FBFEFA8D1A38EF837B_terseLabel_en-US" xlink:label="lab_teso_LineOfCreditFacilitySwingLineLoansCurrentBorrowingCapacity_571F169B46D372FBFEFA8D1A38EF837B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swing line loans, current borrowing capacity</link:label>
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    <link:label id="lab_teso_LineOfCreditFacilityTerm_D6D08A80FCD04B72FD918D1A38EF1472_documentation_en-US" xlink:label="lab_teso_LineOfCreditFacilityTerm_D6D08A80FCD04B72FD918D1A38EF1472" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Term</link:label>
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    <link:label id="lab_teso_LineOfCreditFacilityLetterOfCreditFeePercentage_E9CF4BFAA5C99494A41C8D1A38EF0147_documentation_en-US" xlink:label="lab_teso_LineOfCreditFacilityLetterOfCreditFeePercentage_E9CF4BFAA5C99494A41C8D1A38EF0147" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility, Letter Of Credit Fee Percentage</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityAmountOutstanding_A324D7EAA879F45ED7708D1A38EF9C9E_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityAmountOutstanding_A324D7EAA879F45ED7708D1A38EF9C9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Amount Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_A324D7EAA879F45ED7708D1A38EF9C9E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_9607863F0B9FAD92ED368D1A38EF2A7A_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_9607863F0B9FAD92ED368D1A38EF2A7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit, amount outstanding</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_9607863F0B9FAD92ED368D1A38EF2A7A_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_9607863F0B9FAD92ED368D1A38EF2A7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_9607863F0B9FAD92ED368D1A38EF2A7A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_2D5DFC517F33DE69B8268D1A38EF6DB0_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_2D5DFC517F33DE69B8268D1A38EF6DB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available borrowing capacity</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_2D5DFC517F33DE69B8268D1A38EF6DB0_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_2D5DFC517F33DE69B8268D1A38EF6DB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_2D5DFC517F33DE69B8268D1A38EF6DB0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_1B3DA45918A7B73339CD9D8DE68ECC87_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_ADC5CC9ED6D552C4A59F20C53A6E4420" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of components of income tax expense (benefit)</link:label>
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    <link:label id="lab_us-gaap_ProductWarrantiesDisclosuresAbstract_AA8F6ACB2DB65E8A96389D8DE5E24316_label_en-US" xlink:label="lab_us-gaap_ProductWarrantiesDisclosuresAbstract_6814DD229B5956F68FA6C040D1C4CEEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product Warranties Disclosures [Abstract]</link:label>
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    <link:label id="lab_teso_SaleOfOperatingAssetsPolicyTextBlock_E805D32BC25B2F505151B419429C1C5C_terseLabel_en-US" xlink:label="lab_teso_SaleOfOperatingAssetsPolicyTextBlock_3E0885C3E68F5D31AC2D102C69887C95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale of operating assets</link:label>
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    <link:label id="lab_teso_ManufacturingEquipmentMember_2B233D473C1BE9AD12FF5AA2543B0FF6_terseLabel_en-US" xlink:label="lab_teso_ManufacturingEquipmentMember_2B233D473C1BE9AD12FF5AA2543B0FF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Manufacturing equipment</link:label>
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