Original wall trade vintage catalog for RAY PROOF CORPORATION. Main office was located at 420 Lexington Avenue, New York City, NY. Manufacturers and Contractors of X-Ray Proofing and Light Proofing Materials. Design, Layouts, Construction and Installations. Ray Proof Materials and Methods. Used in Worcester Hospital, Nassau County Sanatorium, Brooklyn State Hospital and the US Veterans Hospital in Bronx, NY, to name a few listed. Unbound from a large 1938 architectural catalog, this unique old one page technical brochure would display wonderful matted and framed. Nice graphics. A terrific addition to your retro wall construction library.