Original old door trade vintage catalog for THE BILCO COMPANY. Main office was located in New Haven, CT. Manufacturers of roof scuttles, floor, sidewalk, basement and pit doors. Doors for Special Services. Basement doors and stair stringers, Series S scuttle, JD doors discussed. This unique 1982 old four page architectural specifications brochure would make a marvelous addition to your retro engineering library. Pages are loose and contain a small amount of residual glue on edge.