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2623172
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Patent Grant
2623172
References
Source
Patent Number
2,623,172
Date Filed
Not available
Date Issued
Tuesday, December 23, 1952
72 years ago
CPC
H04L15/22 - Apparatus or circuits for sending one or a restricted number of signals
H04L15/26 - Operating only on reception of predetermined code signals
US Classifications
327 - Miscellaneous active electrical nonlinear devices, circuits, and systems
340 - Communications: electrical
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