Original industrial trade vintage catalog for CLIFFORD MANUFACTURING. COMPANY.  Main office and factory was located at 564 East First Street, Boston, MA. Manufacturers of Hydron Metallic Bellows. Used as control elements, shaft packings, in thermostatically controlled valves and in a variety of temperature and pressure control apparatus. Disbound from a large 1931 industrial catalog, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro industrial equipment library. Slight damp stain on outer edge.