Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,490 pages of information and 233,936 images on early companies, their products and the people who designed and built them.
L. Kamm and Co, of 27 Powell Street, Goswell Road, London, EC1. Telephone: Central 3349. Cables: "Zerograph, London"
1892 Company established.
1914 Electrical Engineers, Kinematograph Makers. Specialities: Kinematograph Apparatus, Oxygen Generators, Acetylene Generators, Optical Lanterns and Searchlights. 
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Cinematograph and Laboratory Equipment including Latest Design All-Unit Enclosed 35mm sound Projector, (incorporating revolutionary developments; Vacuum-Controlled Soundhead and Gearless Mechanism); also All Angle Commercial Studio Stand. (Olympia, Ground Floor, Stand No. D.1651)