General machine shop of U.S. Steel's National Tube Company in McKeesport, Allegheny County


Group photo of workers in the general machine shop of U.S. Steel's National Tube Company in McKeesport, Allegheny County, 1907
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The National Tube Works Company was acquired and merged with U.S. Steel by J.P. Morgan in 1901.

Library and Archives Division, Historical Society of Western Pennsylvania, Pittsburgh, Pa.