Original roofing trade vintage catalog for AMERICAN SHEET METAL WORKS. Main office was located in New Orleans, LA. Manufacturers of the Patterson Clip for fastening roofing and siding to steel structures. Illustrated full sized sectional view showing the clip fitted over flange of Purlin and corrugated roof sheet. Unbound from a large 1931 architectural catalog, this unique old one page technical specifications brochure would display beautifully matted and framed. Nice graphics. A fantastic addition to your retro roofing construction library.