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air corps machine guns

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Twenty-millimeter machine guns for planes. A big automobile plant, now entirely on war production, has a well-equipped department for the finishing of breeches for Air Corps machine guns. Milling, grinding and other machine operations are handled as expertly as in the days when the plant was making automobile parts. Oldsmobile, Lansing, Michigan

Twenty-millimeter machine guns for planes. A big automobile plant, now...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description