Original window trade vintage catalog for J. S. THORN COMPANY. Main office and factory was located at Allegheny Avenue and Twentieth Street, Philadelphia, PA. Manufacturers of solid steel casement widows. Products featured include skylights, sash operating devices and vertical lift doors. Numerous images, illustrations and architect specifications are provided. Unbound from a large 1931 architectural catalog, this unique old five page technical brochure would display wonderful matted and framed. Nice graphics. A fabulous addition to your retro steel windows library. Pages are detached and may contain a small amount of residual glue on edge.