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July 1942. Melrose Park, Illinois. "Production of aircraft engines. Buick plant. Foreman F.I. Bowman shows Marietta Morgan how to operate this bomb-test machine used to test reconditioned spark plugs. A young Negro girl, Marietta had been a clerk in a meat market. Her lack of industrial experience, however, has been no handicap for her present war job in a large Midwest airplane plant. She's rapidly becoming a skilled and efficient machine operator." Medium format safety negative by Ann Rosener for the Office of War Information. View full size.