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2041431
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Patent Grant
2041431
References
Source
Patent Number
2,041,431
Date Filed
Not available
Date Issued
Tuesday, May 19, 1936
88 years ago
CPC
G10K7/02 - in which the sound-producing member is rotated manually or by a motor
US Classifications
116 - Signals and indicators
192 - Clutches and power-stop control
340 - Communications: electrical
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