Original wall trade vintage catalog for AIR-PATH PRODUCTS COMPANY. (Division of Lloyd E. Mitchell, Inc.) Main office was located at 4620 Doll Avenue, Baltimore, MD. Manufacturers of dampers, louvers and door grilles built to quality specifications in all various metals. E-Truded aluminum. Unbound from a large 1958 architectural catalog, this unique old four page technical brochure would display wonderful matted and framed. Nice cover graphics. A terrific addition to your retro wall construction library. Pages are detached and may contain a small amount of residual glue on edge.