Original insulation trade vintage catalog for W. J. DENNIS & COMPANY. Main office and factory was located at 2110-2120 West Lake Street, Chicago, IL. Manufacturers of Wing Flex Weather Strip, for Standard Double Hung Wood Windows. Features a 6-Point Contact that makes a resilient, impervious, weatherproof seal. Unbound from a large 1938 architectural catalog, this unique old two page technical brochure would display wonderful matted and framed. Nice graphics. A fabulous addition to your retro window weatherstrip library. Pages are detached and may contain a small amount of residual glue on edge.