Brand of electric filament lamps for cars and other uses, and electronic valves, made by BTH Rugby.
1911 BTH acquired licences for all of General Electric's drawn-wire light bulbs, which they produced under the Mazdatrademark[1].
1911 Electrical Exhibition. Mazda lamps from 6 to 600 watts and other equipment[2].
WWI Using its experience in making filament lamps, BTH became a manufacturer of radio valves.
1928 BTH ceased valve making except for special purpose valves that it required for its production of non-domestic electronic equipment[3]
See Also
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Sources of Information
- ↑ The Engineer of 25th August 1911 p197
- ↑ The Engineer of 13th October 1911 p388
- ↑ Competition Commission report