Production. Aircraft engines. Typifying American democracy at work, four soldiers of the production front assemble an airplane engine for Uncle Sam's soldiers of the battlefront. In this, as in other war factories throughout the U.S., prejudice pertaining to differences of race, creed or color have been scrapped by those who recognize that victory must have priority over intolerance. These four men are assembling cylinder barrels to an engine in a giant Midwest aviation plant. Melrose Park, Buick plant