Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,501 pages of information and 233,941 images on early companies, their products and the people who designed and built them.


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September 1933.
April 1939.
September 1947.
August 1948.
January 1949.
March 1949.
December 1951.
September 1953.
June 1955.

of South Ruislip. The first UK company to manufacture a miniature valve.

1930s Established as the Freedman Valve Co

Name changed to the High Vacuum Valve Co, later Hivac

1939 Private company. Automatic Telephone and Electric Co took a controlling interest in Hivac as basis for facilities for electronic development in telecommunications[1].

1944 Automatic Telephone and Electric Co gained full control of Hivac[2].

By 1949 manufacturer of miniature and midget thermionic valves for deaf aids, etc

1961 Manufacturers of thermionic and electronic devices, including subminiature valves, cold cathode tubes, filamentary and neon indicator lamps. 700 employees. [3]

See Also


Sources of Information

  1. [1] Competition Commission
  2. [2]Competition Commission
  3. 1961 Dun and Bradstreet KBE