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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3DE801BEDF8CF9241D3C5B72449BF67C" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3DE801BEDF8CF9241D3C5B72449BF67C" xlink:type="arc" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable_CC7EB063942BBB1168DB5B72449BF158_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable_CC7EB063942BBB1168DB5B72449BF158" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts and Notes Receivable</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_59156F1E90B1424D1B5A5B72449C858D_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_59156F1E90B1424D1B5A5B72449C858D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Decrease in accounts payable</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_EA8EC1E42566FC7EDDD95B72449C5149_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_EA8EC1E42566FC7EDDD95B72449C5149" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Decrease in accrued liabilities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_EA8EC1E42566FC7EDDD95B72449C5149" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_398EF1D3FEBC0ACF9FD25B766065B9ED" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_398EF1D3FEBC0ACF9FD25B766065B9ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_FD4DFB71AF2C827C6D4F5B766065169F_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_FD4DFB71AF2C827C6D4F5B766065169F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net of allowance for doubtful accounts of $415 and $393</link:label>
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    <link:label id="lab_us-gaap_InventoryNet_27B5753C26E583B070655B766065E9B4_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_27B5753C26E583B070655B766065E9B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories, net</link:label>
    <link:label id="lab_us-gaap_InventoryNet_27B5753C26E583B070655B766065E9B4_label_en-US" xlink:label="lab_us-gaap_InventoryNet_27B5753C26E583B070655B766065E9B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
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    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_BA4DBA7E0105AA4E1CE25B766066F80D_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_BA4DBA7E0105AA4E1CE25B766066F80D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense and Other Assets, Current</link:label>
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    <link:label id="lab_us-gaap_AssetsCurrent_4FC02B01CAF4A8C0E58E5B76606658CE_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_4FC02B01CAF4A8C0E58E5B76606658CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_84AFD0C1ABA6636AB2095B7660671BA7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_4F42D636ADA89C4A71255B7660672832_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_4F42D636ADA89C4A71255B7660672832" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AccountsPayableCurrent_383DFC48BF3417D3940A5B76606751DF_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_383DFC48BF3417D3940A5B76606751DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_B4B5D549D4A523936710D10533E1091F_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_B4B5D549D4A523936710D10533E1091F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_B4B5D549D4A523936710D10533E1091F_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_B4B5D549D4A523936710D10533E1091F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_B4B5D549D4A523936710D10533E1091F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_B4B5D549D4A523936710D10533E1091F" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_B4B5D549D4A523936710D10533E1091F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_A366A4166357C9996DA3D10533E18556_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_A366A4166357C9996DA3D10533E18556" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2024</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_A366A4166357C9996DA3D10533E18556_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_A366A4166357C9996DA3D10533E18556" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_A366A4166357C9996DA3D10533E18556" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_A366A4166357C9996DA3D10533E18556" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_A366A4166357C9996DA3D10533E18556" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_A7E14BA88CA6D6958072D10533E15EE6_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_A7E14BA88CA6D6958072D10533E15EE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_A7E14BA88CA6D6958072D10533E15EE6_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_A7E14BA88CA6D6958072D10533E15EE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, after Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_A7E14BA88CA6D6958072D10533E15EE6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_A7E14BA88CA6D6958072D10533E15EE6" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_A7E14BA88CA6D6958072D10533E15EE6" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_D081CA87E175D1259394D10533E20EA1_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_D081CA87E175D1259394D10533E20EA1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease payments</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_D081CA87E175D1259394D10533E20EA1_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_D081CA87E175D1259394D10533E20EA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_D081CA87E175D1259394D10533E20EA1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_D081CA87E175D1259394D10533E20EA1" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_D081CA87E175D1259394D10533E20EA1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_13BC5C06B377C8A21C27D10533E2E322_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_13BC5C06B377C8A21C27D10533E2E322" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less: present value discount</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_13BC5C06B377C8A21C27D10533E2E322_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_13BC5C06B377C8A21C27D10533E2E322" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_13BC5C06B377C8A21C27D10533E2E322" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_13BC5C06B377C8A21C27D10533E2E322" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_13BC5C06B377C8A21C27D10533E2E322" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_0777208DA8D2270F5CC9D10533E3DEEC_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_0777208DA8D2270F5CC9D10533E3DEEC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance Leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_0777208DA8D2270F5CC9D10533E3DEEC_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_0777208DA8D2270F5CC9D10533E3DEEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payment, Due [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_0777208DA8D2270F5CC9D10533E3DEEC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_0777208DA8D2270F5CC9D10533E3DEEC" xlink:to="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_0777208DA8D2270F5CC9D10533E3DEEC" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_F69A232699C235DD02D5D10533E38F09_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_F69A232699C235DD02D5D10533E38F09" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020 (remaining six months)</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_F69A232699C235DD02D5D10533E38F09_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_F69A232699C235DD02D5D10533E38F09" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, to be Paid, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_F69A232699C235DD02D5D10533E38F09" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_F69A232699C235DD02D5D10533E38F09" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_F69A232699C235DD02D5D10533E38F09" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_48C7B34AFF737F4BB41FD10533E36FB4_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_48C7B34AFF737F4BB41FD10533E36FB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_48C7B34AFF737F4BB41FD10533E36FB4_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_48C7B34AFF737F4BB41FD10533E36FB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, to be Paid, Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_48C7B34AFF737F4BB41FD10533E36FB4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_48C7B34AFF737F4BB41FD10533E36FB4" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_48C7B34AFF737F4BB41FD10533E36FB4" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_88D7A1B0FD58B569C881D10533E33925_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_88D7A1B0FD58B569C881D10533E33925" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_88D7A1B0FD58B569C881D10533E33925_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_88D7A1B0FD58B569C881D10533E33925" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, to be Paid, Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_88D7A1B0FD58B569C881D10533E33925" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_88D7A1B0FD58B569C881D10533E33925" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_88D7A1B0FD58B569C881D10533E33925" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_DD0B56B4B94175A6379DD10533E36189_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_DD0B56B4B94175A6379DD10533E36189" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_DD0B56B4B94175A6379DD10533E36189_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_DD0B56B4B94175A6379DD10533E36189" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, to be Paid, Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_DD0B56B4B94175A6379DD10533E36189" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_DD0B56B4B94175A6379DD10533E36189" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_DD0B56B4B94175A6379DD10533E36189" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_BE3BD8B5D428D179EC9AD10533E4E34C_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_BE3BD8B5D428D179EC9AD10533E4E34C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2024</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_BE3BD8B5D428D179EC9AD10533E4E34C_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_BE3BD8B5D428D179EC9AD10533E4E34C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, to be Paid, Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_BE3BD8B5D428D179EC9AD10533E4E34C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_BE3BD8B5D428D179EC9AD10533E4E34C" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_BE3BD8B5D428D179EC9AD10533E4E34C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_A1703CC323C2DE111DA5D10533E42FB4_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_A1703CC323C2DE111DA5D10533E42FB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_A1703CC323C2DE111DA5D10533E42FB4_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_A1703CC323C2DE111DA5D10533E42FB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, to be Paid, after Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_A1703CC323C2DE111DA5D10533E42FB4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_A1703CC323C2DE111DA5D10533E42FB4" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_A1703CC323C2DE111DA5D10533E42FB4" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_B56600E2AEB64DF85CC5D10533E43E4C_totalLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_B56600E2AEB64DF85CC5D10533E43E4C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease payments</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_B56600E2AEB64DF85CC5D10533E43E4C_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_B56600E2AEB64DF85CC5D10533E43E4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payment, Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_B56600E2AEB64DF85CC5D10533E43E4C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_B56600E2AEB64DF85CC5D10533E43E4C" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_B56600E2AEB64DF85CC5D10533E43E4C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_D5997D8D87DFBDF82549D10533E43216_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_D5997D8D87DFBDF82549D10533E43216" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less: present value discount</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_D5997D8D87DFBDF82549D10533E43216_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_D5997D8D87DFBDF82549D10533E43216" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Undiscounted Excess Amount</link:label>
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    <link:label id="lab_us-gaap_OperatingLeaseCost_68961D8990D1EAC9ADE0D105351C11C4_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_68961D8990D1EAC9ADE0D105351C11C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease cost</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseCost_68961D8990D1EAC9ADE0D105351C11C4_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_68961D8990D1EAC9ADE0D105351C11C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Cost</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_AD1FE0222AB9D30F81B1D105351C2BF2_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_AD1FE0222AB9D30F81B1D105351C2BF2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Right-of-Use Asset, Amortization</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseInterestExpense_488AB8A3374AACB03412D105351C0643_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_488AB8A3374AACB03412D105351C0643" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Interest Expense</link:label>
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    <link:label id="lab_us-gaap_VariableLeaseCost_2B64282B7A30EF31C792D105351C62E3_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_2B64282B7A30EF31C792D105351C62E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Lease, Cost</link:label>
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    <link:label id="lab_us-gaap_LeaseCost_13227AED842B58093A6CD105351C0214_label_en-US" xlink:label="lab_us-gaap_LeaseCost_13227AED842B58093A6CD105351C0214" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost</link:label>
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    <link:loc xlink:href="nx-20200430.xsd#nx_InterestRateScenarioAxis" xlink:label="loc_nx_InterestRateScenarioAxis_75C70A01A382961EC631D10532E6062E" xlink:type="locator" />
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    <link:label id="lab_nx_InterestRateScenarioDomain_A507EEB2F1DAA0177B93D10532E73F65_label_en-US" xlink:label="lab_nx_InterestRateScenarioDomain_A507EEB2F1DAA0177B93D10532E73F65" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Scenario [Domain]</link:label>
    <link:label id="lab_nx_InterestRateScenarioDomain_A507EEB2F1DAA0177B93D10532E73F65_documentation_en-US" xlink:label="lab_nx_InterestRateScenarioDomain_A507EEB2F1DAA0177B93D10532E73F65" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Domain] for Interest Rate Scenario [Axis]</link:label>
    <link:loc xlink:href="nx-20200430.xsd#nx_InterestRateScenarioDomain" xlink:label="loc_nx_InterestRateScenarioDomain_A507EEB2F1DAA0177B93D10532E73F65" xlink:type="locator" />
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