Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 146,706 pages of information and 232,164 images on early companies, their products and the people who designed and built them.
of Stanhope House, Kean Street, Aldwych, London, WC2. Telephone: Temple Bar 7064 (5 lines). Cables: "Sunvic, Estrand, London"
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Relays: Electronic Hotwire and Bimetal. "No-loss" Energy Regulators. Time Delays, Thermostats: Adjustable Glass-sealed Oven and Water-heater. Ambient Temperature Recorders. Resistance Thermometer and Toluene Regulator Controllers. Simmerstat Hot-plate Controls. Electronic Relay. (Olympia, Ground Floor, Stand No. A.1041) 
By 1952 was a fully-owned subsidiary of AEI
1955 The factory was located at Harlow