Original industrial trade vintage catalog for THE HAYS CORPORATION. Main office and factory was located at 900 East Eighth Street, Michigan City, IN. Manufacturers of Combustion Instruments. Gages for draft, pressure, CO2 recorders, portable combustion test set and flue gas analyzer. Disbound from a large 1936 industrial catalog, this unique old one page technical brochure would display fantastic matted and framed. A marvelous addition to your retro industrial equipment library.