Original heating trade vintage catalog for JOHNSON SERVICE COMPANY, was located in Milwaukee, WI. Manufacturers of Johnson Control for Heating, Cooling, Ventilating, Air Conditioning, Industrial Processes. Thermostats, Thermometers, Humidity Control, Valves, Dampers, Pneumatic Clocks and Zone Control Systems. Disbound from a large 1938 industrial heating catalog, this unique old twelve page technical specifications brochure would display wonderfully matted and framed. A marvelous addition to your retro heating equipment library. Pages are detached and may contain a small amount of residual glue on edge. Cover is slightly chipped.