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1942. Chrysler Corporation plant at Highland Park, Detroit. "Applying automobile production methods to machining of 40 mm. anti-aircraft gun barrels in a former automobile plant. Five cutting instruments work at the same time. Under the old single-operation methods of gunmaking, only one of these could work at one time. Automobile workers are proud of the improvement." Medium format safety negative by Alfred Palmer for the Office of War Information. View full size.