Tunstall, Byers and Co
of Donacaster
1957 Company incorporated to acquire the radio and television dealers, H. W. Evans and Sons Ltd.
1977 Company renamed Tunstall Byers Holdings Ltd
1980 Developed a two-way communication system for use by the elderly living alone[1]
1981 Tunstall Byers Holdings Ltd was renamed Tunstall Telecom Holdings Ltd
1983 Renamed Tungsten Telecom Group Plc
1983 Maker and installer of emergency communications equipment for the elderly and disabled; listed on USM[2]
1986 Renamed Tungsten Group Plc