The first broadcast transmitter operated in Great Britain, installed at the Marconi Works, Chelmsford, in 1919 and 1920, from The Story of Twenty Five Years, published 1935(The first broadcast transmitter operated in Great Britain, installed at the Marconi Works, Chelmsford, in 1919 and 1920, from The Story of Twenty Five Years, published 1935 )English Photographer |
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Undated · black and white photograph
· Picture ID: 500573
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