Multitone Electric Co
of 223-7 St John Street, Clerkenwell, London, EC1. Telephone: Clerkenwell 8022. Cables: "Multonelec, Smith, London". Consulting Room for the Deaf: 92 New Cavendish Street, London, W1.
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Electro-medical and Anaesthetic Apparatus, Medical Instruments, Operation Tables, Hypodermic Syringes, Instruments for the Deaf and specialised Radio Equipment. (Olympia, Ground Floor, Stand No. C.1523) and Manufacturers of Radio Receivers and Amplifiers including special equipment for Churches and Halls for use as group hearing aid installations; Also Radio Receivers for the Deaf and equipment for specialised Radio Equipment. (Olympia, Ground Floor, Stand No. C.1523) 
1957 Patent - Improvements in transistor amplifiers.