Original plumbing trade vintage catalog for GRINNELL COMPANY, was located in Providence, RI. Manufacturers of adjustable pipe hangers and supports. Swivel ring, wrought clevis, U pipe, clip, CB-universal insert, simplex concrete insert, flange, side beam bracket, extension pipe clamp, u Hook and coach screw clip. Disbound from a large 1936 industrial catalog, this unique old two page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro industrial equipment library. Pages are detached and may contain a small amount of residual glue on edge. Disbound from a large 1936 construction book, these 2 page unique technical data specification sheets contain a small amount of residual glue, and pages are loose. It would make a sensational addition to your engineering library.