HK119095A
(en )
1995-07-28
Digital signal transmission device
EP0142847A3
(en )
1987-09-02
Digital signal generating device
JPS57173292A
(en )
1982-10-25
Interface circuit for telephone line
DE3371023D1
(en )
1987-05-21
Interface module for telephone lines
GB8701506D0
(en )
1987-02-25
Converting digital signals
ZA847378B
(en )
1985-05-29
Force impulse transmission
GB2159369B
(en )
1988-04-07
Communicating digital signals over telephone lines
GB8408037D0
(en )
1984-05-10
Signal transmission device
GB2144946B
(en )
1986-12-31
Telephone answering apparatus
BG37519A1
(en )
1985-06-14
Device for converting impulse signals on telephone lines
GB2113044B
(en )
1985-05-01
Telephone ringing signal generation
GB8415184D0
(en )
1984-07-18
Telephone answering system
GB8406608D0
(en )
1984-04-18
Protective device for telephones
GB2146496B
(en )
1986-11-26
Cable connecting device
GB2185170B
(en )
1988-06-02
Testing telephone lines
GB8330313D0
(en )
1983-12-21
Delivering signal on telephone line
GB8328497D0
(en )
1983-12-21
Impulse device
GB8304933D0
(en )
1983-03-23
Voice actuated instant record-replay device
BG35737A1
(en )
1984-06-15
Device for converting the signal level between interface rs 232 and a telegraph line
SU1155956A1
(en )
1985-05-15
Device for converting frequency-dependent signals
BG36916A1
(en )
1985-02-15
Device for converting communication reports
BG37518A1
(en )
1985-06-14
Device for testing telephone installations
BG36337A1
(en )
1984-10-15
Device for impulse conversion
JPS57104360A
(en )
1982-06-29
Device for transmitting and receiving signal via telephone line
BG36188A1
(en )
1984-09-14
Impulse forming device