Workers at David Lupton's Sons Co. plant in Philadelphia, Pennsylvania, manufacturing parts for 240 mm and 6" trench mortars, Mark I, for the government. This photograph was taken on February 15, 1919, and is labeled as "FOR OFFICIAL USE ONLY."

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

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