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3187109
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Information
Patent Grant
3187109
References
Source
Patent Number
3,187,109
Date Filed
Not available
Date Issued
Tuesday, June 1, 1965
58 years ago
CPC
H04Q3/00 - Selecting arrangements
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
H04Q1/4535 - with an additional signal transmitted for voice protection
H04Q3/42 - Circuit arrangements for indirect selecting controlled by common circuits
US Classifications
379 - Telephonic communications
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