Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,109 pages of information and 233,634 images on early companies, their products and the people who designed and built them.
of 18 New Cavendish Street, London, W1. Telephone: Welbeck 1212. Cables: "Schall, Phone, London"
1939 Company incorporated. Formerly Solus Electrical Ltd
1945 Established Solus Electronic Tubes as a subsidiary making X-ray tubes
1946 Amalgamated with Schall and Son Ltd - presumably forming Solus-Schall Ltd
1947 Listed Exhibitor - British Industries Fair. Manufacturers of X-ray and Electro Medical Apparatus including Superficial Medium and Deep Therapy Apparatus, X-Ray Apparatus for Industrial and Laboratory Research Work and all Accessory Equipment and X-Ray Tubes and Valves. (Olympia, Ground Floor, Stand No. D.1701) 
1961 Offered Trans-Weigh equipment for measuring weight and control of loads on conveyor belts