Public domain
Detroit, Michigan. Assembly of Rolls Royce engines at the Packard Motor Car Company. Checking internal threads on retaining nuts
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. Checking internal threads on retaining nuts. 1943-01-01. Siegel, Arthur S.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.