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3059060
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Information
Patent Grant
3059060
References
Source
Patent Number
3,059,060
Date Filed
Not available
Date Issued
Tuesday, October 16, 1962
61 years ago
CPC
H04M3/40 - Applications of speech amplifiers
H04J1/14 - Arrangements providing for calling or supervisory signals
H04M1/50 - by generating or selecting currents of predetermined frequencies or combinations of frequencies
H04Q1/4465 - the same frequency being used for all signalling information
US Classifications
379 - Telephonic communications
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