Original metal trade vintage catalog for GABRIEL STEEL COMPANY, Main office was located in Detroit, MI. Manufacturers of floor and roof truss joists. Advantages include the method of channel bridging and the extended bottom chord member. No spare parts of attachments are necessary. Unbound from a large 1931 architectural catalog, this unique old two page technical brochure would display beautifully matted and framed. A fantastic addition to your retro building materials library. Pages are detached and may contain a small amount of residual glue on edge.