Public domain
Detroit, Michigan. Assembly of Rolls Royce engines at the Packard Motor Car Company. Inspecting piston rings for flatness and uniformity of thickness
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDetroit, Michigan. Assembly of Rolls Royce engines at the Packard Motor Car Company. Inspecting piston rings for flatness and uniformity of thickness. 1943-01-01. Siegel, Arthur S.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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