Original electrical trade vintage catalog for THE MERCOID CORPORATION. Main office and plant was located at 4213 Belmont Avenue, Chicago, IL.

Manufacturers of Mercury Switches. Automatic controls for heating, air conditioning, refrigeration and various industrial applications. Products include Hermetically Sealed Mercury Switches, DA Pressure and Temperature Controls, Explosion-Proof Cases, Diaphragm Controls, Liquid Level Controls, Lever Arm and Float Controls, Transformer Relays, Type W6 Relays, and The Mechanical Eye. Has numerous product images with detailed descriptions, uses, applications, dimensions and specifications data charts provided. Unbound from a large wartime 1945 engineering designer catalog, this unique old four page technical brochure would display beautifully matted and framed. Awesome cover graphics. A fantastic addition to your vintage electrical control library.