Public domain
Production. Pratt and Whitney airplane engines. Magneto driving gears for Pratt and Whitney airplane motors are tested for hardness on a Rockwell machine in a large Eastern plant producing engines in great numbers for our armed forces. Pratt and Whitney Aircraft
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineProduction. Pratt and Whitney airplane engines. Magneto driving gears for Pratt and Whitney airplane motors are tested for hardness on a Rockwell machine in a large Eastern plant producing engines in . 1942-01-01. United States. Office Of War Information, Feininger, Andreas. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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