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<!-- Created: Fri Apr 10 16:01:00 UTC 2026 -->
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    <loc xlink:type="locator" xlink:label="SCTStockAwardsColumnValueMember" xlink:href="fstr-20260521.xsd#fstr_SCTStockAwardsColumnValueMember"/>
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    <loc xlink:type="locator" xlink:label="ExcessFairValueForEquityAwardModificationsMember" xlink:href="fstr-20260521.xsd#fstr_ExcessFairValueForEquityAwardModificationsMember"/>
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    <loc xlink:type="locator" xlink:label="ecd_PvpTable" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PvpTable"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProfitLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
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