Telecommunication signalling arrangement
Telecommunication switching systems with a central switching and
Telecommunications network having successively utilized...
Telephone branch line transmission circuit with blocking capacit
Telephone line circuit having time-shared DTMF receivers
Telephone switching system
Telephonic console with multipersonality control apparatus and m
Telephonic console with programmable nonvolatile personality mem
Telephonic switching system with a user controlled data memory a
Telephonic-interface statistical analysis system
Tone detector
Tone signal detecting method and tone signal detector
Tracing with keys and locks on a telecommunication network