Public domain
Production. Pratt and Whitney airplane engines. A gear for a Pratt and Whitney engine is tested for hardness on a Rockwell machine in a large Eastern plant now producing a steady flow of airplane motors for the planes that will help us bring victory. 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. A gear for a Pratt and Whitney engine is tested for hardness on a Rockwell machine in a large Eastern plant now producing a steady flow of airplane moto. 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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