Osram

Marconi-Osram Valve Co

• 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.

• 1920 Name of company changed to M-O Valve Co^[.

• 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

• Continued to supply valves to Marconi.

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

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