Original old building vintage catalog  PASS AND SEYMOUR, INC of Syracuse, NY.  Despard Line of Modern Electrical Wiring Devices. Convenience outlets, Bakelite Wall Plates.  Three devices may be used in a single switch box.  20 basic interchangeable devices used to form 59,244 combinations.  Disbound from a large 1938 construction book, these unique four page technical data specification sheets would display wonderfully matted and framed. It would be a marvelous addition to your architecture and engineering library.