Original door trade vintage catalog for  THE BILCO COMPANY. Main office was located in New Haven, CT. Manufacturers of Celladoors, roof scuttles, hatchways, sidewalk elevator and ash hoist door, transformer vault and pit doors, trench covers and frames. This unique 1954 old four page architectural technical specifications brochure would make a marvelous addition to your retro design and engineering library. Pages are loose and contain a small amount of residual glue on edge.