Iron beam under construction at Carnegie Steel Company's Homestead Plant in Pittsburgh, Pennsylvania for the Empire State Building construction. American Bridge Company's Plant at Ambridge, Pennsylvania. Making Rivet holes for cover plates and wing bearing plates. Holes made by machine in beam. Iron scrape made by the process. Process of Multiple spacing punching on cover plates for rivet holes. Operator handle the manipulation according to the given design. Milling process of the wing bearing plates.
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