"General view of forgings at the east end of Building No. 12 in the ordnance manufacturing department at Edgewater Steel Co. in Pittsburgh, Pennsylvania. This photo, taken in December 1918, shows the heat treating process. FOR OFFICIAL USE ONLY. Photographer: Edgewater Steel Co."

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Size: 8565px × 5795px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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