Public domain
Mitchell Field. Business end of a bomber engine. The controllable pitch housing in the propeller hub assembly contains the mechanism that automatically adjusts the set of the three propellers
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineMitchell Field. Business end of a bomber engine. The controllable pitch housing in the propeller hub assembly contains the mechanism that automatically adjusts the set of the three propellers. 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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