PHOTO: Old Sled Works, Duncannon, PA

Beginning in 1901, Chicago-based Exhibit Supply Co. built and sold more than 350 types of arcade games, from pinball machines to personality testers. By the time of this 1941 trade show, the company was renowned for its coin-operated entertainments, such as Donkey Bray, where contestants pulled on the animal's tail to elicit a hee-haw. Exhibit Supply also popularized a few racy amusements, including its Photoscope Picture Machine, whose tagline "La Vie de Boheme, So Frenchy and So Nice" underscored the stereoscopic portraits of the insufficiently clad young women it displayed.