Public domain
Detroit, Michigan. Assembly of Rolls Royce engines at the Packard motor car company. Checking pitch diameter of threaded parts with an inspector
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 pitch diameter of threaded parts with an inspector. 1943-01-01. Siegel, Arthur S.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.