Original heating trade vintage catalog for THE PATTERSON-KELLY COMPANY, INC. was located at 101 Park Avenue, New York City, NY. Water Heating Engineers and Manufacturers of Hot Water Heaters for More Than 50 Years. Horizontal Heater Type B, Vertical Type L, Instantaneous Type D. Unbound from a large 1938 architectural catalog, this unique old one page technical specifications brochure would display beautifully matted and framed. A fantastic addition to your retro heating collection.