Public domain
Production. Airplane propellers. Finished stationary cams for the hydraulic mechanism that adjust the pitch of airplane propeller blades while planes are in action. The Hartford, Connecticut, plant, where they are stored in turning out great numbers of two- three- and four-blade propellers
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineProduction. Airplane propellers. Finished stationary cams for the hydraulic mechanism that adjust the pitch of airplane propeller blades while planes are in action. The Hartford, Connecticut, plant, w. 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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