Public domain
Detroit, Michigan. Assembly of Rolls Royce engines at the Packard motor car company. Stamping valves with quality marks after inspection
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. Stamping valves with quality marks after inspection. 1943-01-01. Siegel, Arthur S.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.