Original electrical trade vintage catalog for THE TRUMBULL ELECTRIC MANUFACTURING COMPANY, was located in Plainville, CT. Manufacturers of The Circle T line for magnetic and manual starters and controllers, safety switches. Type R.B, R.M, C, T.M. Branch switch, switchboard and panelboard. Disbound from a large 1936 electrical construction materials book, this unique old two page technical specifications brochure would display wonderfully matted and framed. A marvelous addition to your retro electric equipment library. Pages are detached and may contain a small amount of residual glue on edge.