Original classroom trade vintage catalog for WEBER COSTELLO COMPANY of Chicago Heights, IL. Manufacturers of Blackboards, Map and Display Rail, Swinging Leaf Board. Practical for school classrooms, laboratories, libraries and auditoriums. Sterling Blackboard. Hyloplate Blackboard. Company was known to produce products containing asbestos. Disbound from a large 1938 construction equipment book, this unique old five page technical data specification brochure would display wonderfully matted and framed. A marvelous addition to your retro architecture design and engineering library.