Original classroom trade vintage catalog for THOMAS INDUSTRIES INC. Main office was located in Des Plaines, IL. Manufacturers of Visionell porcelain chalkboards, marketed, installed and tested under all types of classroom applications. Ready framed details, wood ground details provided. Specifications for aluminum trim and porcelain chalkboards listed. This unique 1964 old eight page architect brochure would make a marvelous addition to your retro designing library. Pages are loose and contain a small amount of residual glue on edge.