SING an English transmitting valve, a Johannesburg experimen: ter established wireless communication with a Californian station in daylight, thus setting up a South African record for amateur transmitters,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280713.2.66
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Radio Record, Volume I, Issue 52, 13 July 1928, Page 15
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28Untitled Radio Record, Volume I, Issue 52, 13 July 1928, Page 15
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