Public domain
Twenty-millimeter machine guns for planes. Just as the "long rifle" of the American pioneer was the world's best gun of its day, so the machine guns of our modern air force must be better than any other. Shaping a machine gun barrel is exacting work, but the precision techniques of a former auto pla
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Credit lineTwenty-millimeter machine guns for planes. Just as the "long rifle" of the American pioneer was the world's best gun of its day, so the machine guns of our modern air force must be better than any oth. 1942-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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