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Edison Swan Electric Co Ltd After WWI, the company extended its range of bright emitter valves and introduced its first dull emitter type, the ARDE, in 1923. Prior to the AEI merger, the valves were manufactured at Ponders End with the brand name EDISWAN. (Some valves up to 1923 were marked ROYAL EDISWAN.) In 1929, the year after the AEI merger, the Cosmos Lamps works at Brimsdown was transferred to Edison Swan to work in conjunction with their factory a mile down the River Lea at Ponders End. From this time, the BTH brand name MAZDA was used, although the EDISWAN name was retained for high power and industrial valves, also for valves sold into some overseas territories. In 1940, a 'shadow factoryb was built at Baldock as an insurance against enemy bombing, but this was closed in 1946. From this time, the main production of radio valves was at Sunderland. By 1955, this new facility was producing some 12 million MAZDA radio valves per year and employing a staff of about 1,000.
Reference: 1004.
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