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FK Type Cellular Steel Beams - 1940's

FK Type Cellular Steel Beams - 1940's

FK Type Cellular Steel Beams - 1940's

(OP)
Has anyone run across the designation FK18-18 (or 10-10) @6.7 PLF (or 18.5 PLF) for a cellular (i.e. castellated) steel beam - circa 1940's - midwestern US

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