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2249158
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Patent Grant
2249158
References
Source
Patent Number
2,249,158
Date Filed
Not available
Date Issued
Tuesday, July 15, 1941
82 years ago
CPC
H04R13/00 - Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
H04R13/02 - Telephone receivers
US Classifications
381 - Electrical audio signal processing systems and devices
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