Antiaircraft gun carriage. This master machinist lays out the precision parts that go to make up a thirty-seven millimeter anti-aircraft gun carriage. Swift flying planes present a difficult target, the anti-aircraft gun must be a precision instrument. War program production scene in one of Pennsylvania's heavy industry plants now converted to the production of vitally needed military equipment. AETNA. Ellwood CIty, Pennsylvania
Palmer, Alfred T., photographer
United States. Office for Emergency Management.
Library of Congress