A photograph showing an aeroplane engine being manufactured by the Hall-Scott Motor Car Co. Inc. in San Francisco, California. This engine model is used in military aircraft during World War One. This photo was taken on September 12, 1918, and is classified as "For Official Use Only."

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Size: 8389px × 5673px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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