GB2075800B
(en )
1984-02-15
Communication system
NL149352B
(en )
1976-04-15
TELEPHONE SYSTEM WITH EXTENSIVE SUBSCRIBER FACILITIES.
IL26602A
(en )
1971-10-20
Telephone extension system
NL146018B
(en )
1975-05-15
TIME MULTIPLEX TELEPHONE SYSTEM WITH LINE CONCENTRATORS.
ZM9668A1
(en )
1970-11-19
Telephone system with added main line subscriber facilities
CS180558B2
(en )
1978-01-31
Multidegree line-frome connecting lines network
ZA715347B
(en )
1972-07-26
Automatic telephone dialling and signalling system
CA815601A
(en )
1969-06-17
Telephone system with added main line subscriber facilities
AU408429B2
(en )
1968-08-08
Telephone system with added main line subscriber facilities
CA859348A
(en )
1970-12-22
Telephone system with added main line subscriber facilities
AU1729067A
(en )
1968-08-08
Telephone system with added main line subscriber facilities
IL29996A0
(en )
1968-07-25
Electronic telephone calling system
AU431288B2
(en )
1971-04-22
Arrangement for voice-frequency signalling in telephone systems
CA797341A
(en )
1968-10-22
Auxiliary interconnecting unit for multi-line subscriber telephone system
IE32563B1
(en )
1973-09-19
Telephone switchboard apparatus
CA782007A
(en )
1968-04-02
Telephone answering system
IL33157A0
(en )
1969-12-31
Improvements in subscriber telephone apparatus
CA801832A
(en )
1968-12-17
Telephone extension system
CA776803A
(en )
1968-01-23
Telephone system
CA792853A
(en )
1968-08-20
Telephone system
CA783256A
(en )
1968-04-16
Subscriber communication system
AU6207269A
(en )
1971-04-22
Arrangement for voice-frequency signalling in telephone systems
GB1200270A
(en )
1970-07-29
Improvements in telephone switchboards
CA778874A
(en )
1968-02-20
Private branch exchange telephone system with dial transfer facilities
CA782009A
(en )
1968-04-02
Centralized repertory system for multifrequency signaling telephones