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Truvox Ltd, of Mount Street, London
Truvox established as private company by Daniel Dan Prenn, a Russian emigre.
Truvox was well known for its Public Address loudspeakers and systems. These covered the whole spectrum of this market and included such units as horns and loudspeakers for cinemas and many acoustic devices for the Forces which Truvox had developed and produced during World War Two.
1949 Truvox acquired Rola Celestion.
1951 Private company.
1961 Manufacturers of industrial floor cleaning machines, tape recording and acoustical equipment, including Truvox industrial scrubbing, drying and polishing machines; Husky industrial polisher/scrubber; Juno domestic floor polisher; Truvox cylinder and upright vacs; Novalux electric fan heaters; Truvox tape recorders, models R6 and R7, Melody and Harmony, Truvox radio jacks, stethoset headphones; telephone attachments. 150 employees. 
1969 Reverse take-over of Truvox Engineering, "the Rola firm", which was injected into the Weingarten Brothers corsetry group; this transaction valued the owner (D. D. Prenn)'s shares at £1.26 million; the assets of Truvox included £1 million worth of Racal Electronics shares. The company created by this was named Celestion Industries plc.