Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,960 pages of information and 233,606 images on early companies, their products and the people who designed and built them.
of Brook Green Works, Hammersmith, London.
1920 Jan. Physical and Optical Societies Exhibition. Exhibited wireless telegraphy.
1927 Recorded as being a subsidiary of GEC
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
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.