Public domain
Production. Pratt and Whitney airplane engines. A propeller shaft of a Pratt and Whitney airplane engine is carefully checked for concentricity in a large Eastern plant steadily producing at a high rate for our armed forces. Pratt and Whitney Aircraft
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Credit lineProduction. Pratt and Whitney airplane engines. A propeller shaft of a Pratt and Whitney airplane engine is carefully checked for concentricity in a large Eastern plant steadily producing at a high ra. 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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