Original old door trade vintage catalog for THE BILCO COMPANY. Main office was located at 164 Hallock Avenue, New Haven, CT.  Manufacturers of Celladoor. Make basements below grade safe and accessible for work or play with a Bilco All-Metal Celladoor. A modern all-metal, all-purpose packaged stair, Bilco Unistair. This unique 1948 old four page architectural technical specifications brochure would make a marvelous addition to your retro engineering library. Removed from a large bound compilation of design and construction catalogs. Contains a small amount of residual glue on edge.