of Purley Way, Croydon, Surrey. Telephone: Thornton Heath 3211. Cables: "Instradio, Croydon"
1922 Exhibited a crystal set at the 1922 Wireless Exhibition
1925 "Radio Instruments, Ltd, of 12. Hyde-street, New-Oxford-street, London, , W.C.1 , informs us that it has just appointed new representatives in the Northern district."
1936 The instrument manufacturing department of Radio Instruments Ltd, of Croydon, approved manufacturers to the Air Ministry and other Government departments, was acquired by Aeronautical and General Instruments but not the part of the business concerned with wireless receiving sets and parts for home use.
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Radio Apparatus. (Olympia, Ground Floor, Stand No. C.1539)