N unusual application of "wireless" is reported from America, where a tuned circuit and metres, as used for radio, are employed to check the out-, put of chewing-gum machines.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19281109.2.72
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Radio Record, Volume II, Issue 11, 9 November 1928, Page 31
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29Untitled Radio Record, Volume II, Issue 11, 9 November 1928, Page 31
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