Bofors forty-millimeter mounts. Gears for guns-for-victory. Hundreds of these precision cut gears roll off specially designed gear-cutters daily in the Bofors plant of a large rubber factory. When assembled, they'll be part of the Bofors forty- millimeter anti-aircraft gun mounts and carriages, some of the war essentials now manufactured in a plant whose sole product used to be tires for the family sedan