Many thanks for all your input. The article is complete and going to press. Gave coverage to Bendix, Lockheed, Steeldraulic, Timkin Hydostatic, and Huck mechanical and hydraulic brakes (Chev to 1950). The person who asked about the address in Detroit of Lockheed's Hydraulic Brake Company, it was 2843 E. Grand Blvd, Detroit, MI