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3270144
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Information
Patent Grant
3270144
References
Source
Patent Number
3,270,144
Date Filed
Not available
Date Issued
Tuesday, August 30, 1966
57 years ago
CPC
H04B3/42 - Circuits for by-passing of ringing signals
H01M8/24 - Grouping of fuel cells
H04Q1/453 - in which m-out-of-n signalling frequencies are transmitted
H04Q1/4535 - with an additional signal transmitted for voice protection
H04Q1/46 - comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency
H04Q3/00 - Selecting arrangements
Y02E60/50 - Fuel cells
US Classifications
379 - Telephonic communications
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