By Larry LeMasters
Edward Swartz, J. M. Welsman, Isadore Marks, and Benjamin Marks formed the Keystone Manufacturing Company in 1919, following World War I. Located in Boston, Massachusetts, the company was founded to produce moving picture machines, commonly called projectors. The company became famous for its line of pressed steel toys that were modeled after Packard trucks of the day and featured the Packard logo on the grill.
