active 1944-1954, laboratory apparatus & instrument maker, London, England W and J George and Becker Limited 1910 - 1954
c. 1908-c. 1957, manufacturer of photographic film and accessories, England Dufay-Chromex Limited 1930 - 1957
1930-1952, audio, phonographic products and magnetic recording manufacturer, Cleveland, United States Brush Development Company 1930 - 1952
1930-1994, manufacturer of recording equipment, Arlington, United States Ralph Gerbrands Company 1930 - 1994
1928-1946, camera and photographic equipment manufacturer, Rochester Folmer Graflex Corporation 1928 - 1946
1929-1934, manufacturer, Saltley Metropolitan-Cammell Carriage, Wagon & Finance Company Ltd. 1929 - 1934
active 1928-1956, manufacturer of automatic and dispensing machines, London, England British Automatic Company Limited 1928 - 1956
1930s-1978, manufacturer of uniforms and helmets, England J Compton Sons and Webb Limited 1930 - 1978