Public domain
Students machinists being shown the proper finish required on gear pockets and bearing shaft bores of an aluminum oil pump housing. Packard marine plant
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineStudents machinists being shown the proper finish required on gear pockets and bearing shaft bores of an aluminum oil pump housing. Packard marine plant. 1941-01-01. United States. Office Of War Information, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.