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<!-- Created: Fri Apr 11 16:25:57 UTC 2025 -->
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    <loc xlink:type="locator" xlink:label="fstr_ExcessFairValueForEquityAwardModificationsMember" xlink:href="fstr-20250522.xsd#fstr_ExcessFairValueForEquityAwardModificationsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="fstr_ExcessFairValueForEquityAwardModificationsMember_lbl" xml:lang="en-US">Excess Fair Value for Equity Award Modifications [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="fstr_SCTStockAwardsColumnValueMember_lbl" xml:lang="en-US">SCT &#8220;Stock Awards&#8221; column value [Member]</label>
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