A Novel Burglar Alarm
A MICROPHONE has been installed in a Chicago bank vault as a burglar alarm, and is connected to. the nearest police station. It is smaller than those used in broadcasting, but so sensitive that the slightest noise causes it to function. It is expected to prove useful in case someone is accidentalty locked in the vault, as well as in the event of attempted robbery.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19301219.2.42
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Radio Record, Volume IV, Issue 23, 19 December 1930, Page 8
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69A Novel Burglar Alarm Radio Record, Volume IV, Issue 23, 19 December 1930, Page 8
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