Original industrial trade vintage catalog for SPENCE ENGINEERING COMPANY, INC. main office was located at 110 East 42nd Street, New York City, NY. Manufacturers of Metal Diaphragm Dead End Regulators, Type EWM3T Weather Compensator. Unbound from a large 1936 industrial catalog, this unique old one page technical brochure would exhibit beautifully matted and framed. A fantastic addition to your retro industrial equipment collection.