Public domain
Detroit, Michigan. Assembly of Rolls Royce engines at the Packard Motor Car Company. Rockwell hardness tester testing hardness of metal in a bolt
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. Rockwell hardness tester testing hardness of metal in a bolt. 1943-01-01. Siegel, Arthur S.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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