TF a loudspeaker is connected to the input terminals of an amplifier, speech from this can be reproduced by
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290315.2.51
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Radio Record, Volume II, Issue 35, 15 March 1929, Page 25
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19Untitled Radio Record, Volume II, Issue 35, 15 March 1929, Page 25
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