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2205669
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Information
Patent Grant
2205669
References
Source
Patent Number
2,205,669
Date Filed
Not available
Date Issued
Tuesday, June 25, 1940
84 years ago
CPC
H04R13/02 - Telephone receivers
H04R11/00 - Transducers of moving-armature or moving-core type
Y10T29/49073 - by assembling coil and core
US Classifications
381 - Electrical audio signal processing systems and devices
029 - Metal working
335 - Electricity: magnetically operated switches, magnets, and electromagnets
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