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2200462
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Patent Grant
2200462
References
Source
Patent Number
2,200,462
Date Filed
Not available
Date Issued
Tuesday, May 14, 1940
84 years ago
CPC
H04R3/10 - of variable resistance microphones
H04R3/005 - for combining the signals of two or more microphones
US Classifications
379 - Telephonic communications
330 - Amplifiers
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