N English listener has just incorporated a penny-in-the-slot fitting to his radio receiver, thus ensuring that when new batteries are required -he has the necessary cash available. Instead of using an off-on switch, it is necessary to drop a penny in the slot to set the receiver in operation,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310925.2.32
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Radio Record, Volume V, Issue 11, 25 September 1931, Page 9
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49Untitled Radio Record, Volume V, Issue 11, 25 September 1931, Page 9
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