Public domain
Tank armor production. Carnegie-Illinois Steel Corporation. Farrell, Pennsylvania. Cutting tools for planers in an armor plate mill are forged from high speed steel on the steam hammer of a big Eastern mill producing tank armor
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineTank armor production. Carnegie-Illinois Steel Corporation. Farrell, Pennsylvania. Cutting tools for planers in an armor plate mill are forged from high speed steel on the steam hammer of a big Easter. 1941-01-01. Palmer, Alfred T., United States. Office For Emergency Management. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.