Loudspeakers Control Railway Traffic
EVERAL railway stations in the British Isles have installed louéspeakers for speedy communication trafic news to passengers. Usuw. one microphone is installed in the mé signal box, with another in the station master’s. office. Loudspeakers are ip stalled at platform entrances and: the booking hall
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310403.2.40
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Radio Record, Volume IV, Issue 38, 3 April 1931, Page 11
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49Loudspeakers Control Railway Traffic Radio Record, Volume IV, Issue 38, 3 April 1931, Page 11
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