Original heating trade vintage catalog for JOHNSON SERVICE COMPANY.  Main office and plant was located in Milwaukee, Wisconsin.

Manufacturers of Temperature and Humidity Control. Products include All-metal Thermostats, Johnson Dual or Two-Temperature Thermostat, Humidostats and Humidifiers, Auto Regulation of Ventilating and Air Conditioning, Process Control and Zone Control are all featured.  Has numerous product images with detailed descriptions, illustrations and applications provided. Unbound from a large 1935 architectural product catalog, this unique old one-page brochure would display beautifully matted and framed. Nice graphics. A fantastic addition to your vintage construction materials library.