American soldier hammering steel bars for gun shields at the Henry Disston and Sons factory in Philadelphia, Pennsylvania. The hammer is operated by steam and exerts a 4500 lb. pressure. The process of hammering makes the steel denser and tougher. This photograph was taken on November 29, 1918, and passed censorship on December 2,

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Size: 8391px × 5637px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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