Public domain
Production. Marine boilers. Burning a hole in a large hyperbolic valve block that will be part of a hyperbolic press in a powder factory. Site: a Midwest plant converted to war production
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineProduction. Marine boilers. Burning a hole in a large hyperbolic valve block that will be part of a hyperbolic press in a powder factory. Site: a Midwest plant converted to war production. 1942-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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