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2205670
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Information
Patent Grant
2205670
References
Source
Patent Number
2,205,670
Date Filed
Not available
Date Issued
Tuesday, June 25, 1940
84 years ago
CPC
H04R13/02 - Telephone receivers
H04R1/225 - for telephonic receivers
US Classifications
381 - Electrical audio signal processing systems and devices
181 - Acoustics
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