Public domain
Chrysler tank arsenal. This is a milling operation. The four-pound metal piece with the aperture is actually the turret for a 37 mm anti-aircraft gun, part of the equipment for an M-3 tank. Extreme accuracy is required in the milling of these parts, because it is important that they be able to move
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineChrysler tank arsenal. This is a milling operation. The four-pound metal piece with the aperture is actually the turret for a 37 mm anti-aircraft gun, part of the equipment for an M-3 tank. Extreme ac. 1940-01-01. United States. Office Of War Information, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.