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2505519
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Information
Patent Grant
2505519
References
Source
Patent Number
2,505,519
Date Filed
Not available
Date Issued
Tuesday, April 25, 1950
74 years ago
CPC
H04R13/02 - Telephone receivers
H04R1/225 - for telephonic receivers
US Classifications
381 - Electrical audio signal processing systems and devices
367 - Communications, electrical: acoustic wave systems and devices
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