Original 1955 Oil and Gas trade vintage catalog for the MERCOID CORPORATION.  Main office and plant were located at 4201 Belmont Avenue, Chicago, IL.

Manufacturers of Mercoid Automatic Controls.  Equipped Exclusively with Hermetically Sealed Mercury Switches, Thereby Assuring Greater Safety, Better Performance and Longer Control Life. 

Mercoid Controls are used with electrically operated equipment involving changes in temperature, pressure, liquid level or mechanical movement.

Products include Mercury Switches, Series 'D' Pressure Controls, Series 'D' Remote Stem Temperature Controls, Transformer Relays, Liquid Level Controls, Lever Arm Controls, Line Voltage Thermostats and Low Voltage Thermostats, all are fully featured.

Has product images, description and applications provide product details.

Unbound from a large rare 1955-56 Composite Catalog, this unique old one-page technical brochure would display beautifully matted and framed. Nice graphics. A fabulous addition to your retro oilfield petroleum industry library.