Original window trade vintage catalog for UNIQUE BALANCE COMPANY. Main office and plant was located at 25 Bruckner Boulevard, Bronx, New York City, NY. Manufacturers of sash balances for double hung windows. A true counter balance not a friction device. Topics include differences between springs, other sash balances and the Unique sash balance, how it operates, typical frame details, types of bay and mullion window details, grooving for balances & specs and economical construction details are supplied. Unbound from a large 1956 architectural catalog, this unique old eight page technical brochure would display wonderful matted and framed. Nice graphics. A wonderful addition to your retro window sash library. Pages are detached and may contain a small amount of residual glue on edge.