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 148,459 pages of information and 233,880 images on early companies, their products and the people who designed and built them.

Marconi-Osram Valve Co

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July 1945.

of Brook Green Works, Hammersmith, London.

1919 Marconi-Osram Valve Company formed as company owned jointly by GEC and Marconi's Wireless Telegraph Co; it took over GEC's valve factory.[1].

1920 Name of company changed to M-O Valve Co.[2].

1920 Jan. Physical and Optical Societies Exhibition. Exhibited wireless telegraphy.

1927 Recorded as being a subsidiary of GEC

1929 Gramophone Co acquired Marconiphone Co as well as Marconi's share in M-O Valve[3].

Continued to supply valves to Marconi.

1956 GEC purchased EMI's share in the M-O Valve company.

1958 Business had been focussed on thermionic devices for telecommunications, radar and military, and cathode ray tubes[4]

1969 Formation of GEC Electronic Tubes to bring together M-O Valve Co and English Electric Valve Co, a company which would have half of UK valve production, the largest specialised valve manufacturer outside USA[5].

See Also


Sources of Information

  1. Competition Commission [1]
  2. Competition Commission [2]
  3. Competition Commission [3]
  4. The Times, Sep 05, 1958
  5. The Times, 22 April 1969