Transistorized annunciator with a recorded message
United States Patent 3409745

Inventors:
Kock, Winston E.
Publication Date:
11/05/1968
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Primary Class:
360/12
Other Classes:
340/286.120, 360/61, 340/328
International Classes:
G08B3/10; G08B3/00
US Patent References:
2910689Transistor horn
2977418Combined oscillator and head phone for code practice
3002187Door chime




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