Research and Control Instruments
of Nightingale Lane, London SW.
of Kings Cross Road, London.
1935 Private company formed as Radio Transmission Equipment Ltd.
1943 Presented microphone and amplifier to South London Hospital for Women.[1]
1947 Name changed.
1958 Name changed to Mullard Equipment Ltd.[2]
By 1960 Radio Transmission Equipment was (part of) Research and Control Instruments Ltd.[3]
1961 Scientific equipment, instruments, welding supplies, filtration, equipment and high frequency generators. 195 employees. [4]
By 1962 was a subsidiary of Philips Electrical.
Made X-ray machine for testing of metals[5]
1962 Joint venture of Research and Control Instruments with Redifon of the Rediffusion group, pooling the 2 companies' induction and dielectric heating businesses; to be called Intertherm; based in Brixton.[6]
1966 Research and Control Instruments was voluntarily wound up[7]
1967 After several years losses, Rediffusion sold its interest in Intertherm to Philips.[8]