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    <link:label id="lab_b_ContractwithCustomerAssetPercentChange_03C1039746A41F3FE55526D6FF1D07D0_terseLabel_en-US" xlink:label="lab_b_ContractwithCustomerAssetPercentChange_03C1039746A41F3FE55526D6FF1D07D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unbilled receivables (contract assets), % Change</link:label>
    <link:label id="lab_b_ContractwithCustomerAssetPercentChange_03C1039746A41F3FE55526D6FF1D07D0_label_en-US" xlink:label="lab_b_ContractwithCustomerAssetPercentChange_03C1039746A41F3FE55526D6FF1D07D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset, Percent Change</link:label>
    <link:label id="lab_b_ContractwithCustomerAssetPercentChange_03C1039746A41F3FE55526D6FF1D07D0_documentation_en-US" xlink:label="lab_b_ContractwithCustomerAssetPercentChange_03C1039746A41F3FE55526D6FF1D07D0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset, Percent Change</link:label>
    <link:loc xlink:href="b-20190331.xsd#b_ContractwithCustomerAssetPercentChange" xlink:label="loc_b_ContractwithCustomerAssetPercentChange_03C1039746A41F3FE55526D6FF1D07D0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ContractWithCustomerLiability_BF9E2C506CC9FB4F945926D6FF1DE533_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_BF9E2C506CC9FB4F945926D6FF1DE533" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Contract liabilities</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerLiability_BF9E2C506CC9FB4F945926D6FF1DE533_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_BF9E2C506CC9FB4F945926D6FF1DE533" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_BF9E2C506CC9FB4F945926D6FF1DE533" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability_BF9E2C506CC9FB4F945926D6FF1DE533" xlink:to="lab_us-gaap_ContractWithCustomerLiability_BF9E2C506CC9FB4F945926D6FF1DE533" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination_3C038C652B97FDB17A9426D6FF1DA03F_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination_3C038C652B97FDB17A9426D6FF1DA03F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract liabilities, $ Change</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination_3C038C652B97FDB17A9426D6FF1DA03F_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination_3C038C652B97FDB17A9426D6FF1DA03F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination_3C038C652B97FDB17A9426D6FF1DA03F" xlink:type="locator" />
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    <link:label id="lab_b_ContractwithCustomerLiabilityPercentChange_B5AD87FDD10F309EFCC726D6FF1DB1FF_terseLabel_en-US" xlink:label="lab_b_ContractwithCustomerLiabilityPercentChange_B5AD87FDD10F309EFCC726D6FF1DB1FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract liabilities, % Change</link:label>
    <link:label id="lab_b_ContractwithCustomerLiabilityPercentChange_B5AD87FDD10F309EFCC726D6FF1DB1FF_label_en-US" xlink:label="lab_b_ContractwithCustomerLiabilityPercentChange_B5AD87FDD10F309EFCC726D6FF1DB1FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability, Percent Change</link:label>
    <link:label id="lab_b_ContractwithCustomerLiabilityPercentChange_B5AD87FDD10F309EFCC726D6FF1DB1FF_documentation_en-US" xlink:label="lab_b_ContractwithCustomerLiabilityPercentChange_B5AD87FDD10F309EFCC726D6FF1DB1FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability, Percent Change</link:label>
    <link:loc xlink:href="b-20190331.xsd#b_ContractwithCustomerLiabilityPercentChange" xlink:label="loc_b_ContractwithCustomerLiabilityPercentChange_B5AD87FDD10F309EFCC726D6FF1DB1FF" xlink:type="locator" />
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    <link:label id="lab_b_ContractwithCustomerNetAssetLiability_046E742BE1D617606C9426D6FF1D1C5B_totalLabel_en-US" xlink:label="lab_b_ContractwithCustomerNetAssetLiability_046E742BE1D617606C9426D6FF1D1C5B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net contract liabilities</link:label>
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    <link:label id="lab_b_ContractwithCustomerNetAssetLiability_046E742BE1D617606C9426D6FF1D1C5B_documentation_en-US" xlink:label="lab_b_ContractwithCustomerNetAssetLiability_046E742BE1D617606C9426D6FF1D1C5B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract with Customer, Net Asset (Liability)</link:label>
    <link:loc xlink:href="b-20190331.xsd#b_ContractwithCustomerNetAssetLiability" xlink:label="loc_b_ContractwithCustomerNetAssetLiability_046E742BE1D617606C9426D6FF1D1C5B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_b_ContractwithCustomerNetAssetLiability_046E742BE1D617606C9426D6FF1D1C5B" xlink:to="lab_b_ContractwithCustomerNetAssetLiability_046E742BE1D617606C9426D6FF1D1C5B" xlink:type="arc" />
    <link:label id="lab_b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress_53510370D8B58296104E26D6FF1D7C36_terseLabel_en-US" xlink:label="lab_b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress_53510370D8B58296104E26D6FF1D7C36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net contract liabilities, $ Change</link:label>
    <link:label id="lab_b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress_53510370D8B58296104E26D6FF1D7C36_label_en-US" xlink:label="lab_b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress_53510370D8B58296104E26D6FF1D7C36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Net Asset (Liability), Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress</link:label>
    <link:label id="lab_b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress_53510370D8B58296104E26D6FF1D7C36_documentation_en-US" xlink:label="lab_b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress_53510370D8B58296104E26D6FF1D7C36" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract with Customer, Net Asset (Liability), Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress</link:label>
    <link:loc xlink:href="b-20190331.xsd#b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress" xlink:label="loc_b_ContractwithCustomerNetAssetLiabilityCumulativeCatchupAdjustmenttoRevenueChangeinMeasureofProgress_53510370D8B58296104E26D6FF1D7C36" xlink:type="locator" />
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    <link:label id="lab_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD_terseLabel_en-US" xlink:label="lab_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net contract liabilities, % Change</link:label>
    <link:label id="lab_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD_label_en-US" xlink:label="lab_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset (Liability), Percent Change</link:label>
    <link:label id="lab_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD_documentation_en-US" xlink:label="lab_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset (Liability), Percent Change</link:label>
    <link:loc xlink:href="b-20190331.xsd#b_ContractwithCustomerAssetLiabilityPercentChange" xlink:label="loc_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD" xlink:to="lab_b_ContractwithCustomerAssetLiabilityPercentChange_E6C05C85D283DA36D02426D6FF1D5DDD" xlink:type="arc" />
    <link:label id="lab_us-gaap_CustomerAdvancesCurrent_9BDD766E92BDAB1A0AED26D6FF1D614A_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_9BDD766E92BDAB1A0AED26D6FF1D614A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer advances</link:label>
    <link:label id="lab_us-gaap_CustomerAdvancesCurrent_9BDD766E92BDAB1A0AED26D6FF1D614A_label_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_9BDD766E92BDAB1A0AED26D6FF1D614A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Advances, Current</link:label>
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    <link:label id="lab_b_ContractwithCustomerLiabilityRevenueRecognizedPercent_E7F2D31481830B31161A27038AF9D50A_terseLabel_en-US" xlink:label="lab_b_ContractwithCustomerLiabilityRevenueRecognizedPercent_E7F2D31481830B31161A27038AF9D50A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percent of liability revenue recognized</link:label>
    <link:label id="lab_b_ContractwithCustomerLiabilityRevenueRecognizedPercent_E7F2D31481830B31161A27038AF9D50A_label_en-US" xlink:label="lab_b_ContractwithCustomerLiabilityRevenueRecognizedPercent_E7F2D31481830B31161A27038AF9D50A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability, Revenue Recognized, Percent</link:label>
    <link:label id="lab_b_ContractwithCustomerLiabilityRevenueRecognizedPercent_E7F2D31481830B31161A27038AF9D50A_documentation_en-US" xlink:label="lab_b_ContractwithCustomerLiabilityRevenueRecognizedPercent_E7F2D31481830B31161A27038AF9D50A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability, Revenue Recognized, Percent</link:label>
    <link:loc xlink:href="b-20190331.xsd#b_ContractwithCustomerLiabilityRevenueRecognizedPercent" xlink:label="loc_b_ContractwithCustomerLiabilityRevenueRecognizedPercent_E7F2D31481830B31161A27038AF9D50A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTable_D759A5B290DACF15E7589245A0362CCB_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTable_D759A5B290DACF15E7589245A0362CCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, by Balance Sheet Grouping [Table]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_D759A5B290DACF15E7589245A0362CCB" xlink:type="locator" />
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