CH329937A
(en )
1958-05-15
Subscriber telephone station with anti-eavesdropping
FR1126455A
(en )
1956-11-23
Automatic telephone
CH331072A
(en )
1958-06-30
Circuit arrangement for a subscriber line in an automatic telephone exchange
FR1145178A
(en )
1957-10-23
Automatic telephone
DK82651C
(en )
1957-04-08
Subscriber line connection in automatic telephone exchanges.
CH343462A
(en )
1959-12-31
Telephone subscriber set
FR1134091A
(en )
1957-04-05
Subscriber telephone set
IE22101L
(en )
1954-11-22
Subscriber billing in automatic exchanges.
IE22150L
(en )
1955-06-03
Automatic telecommunication exchanges.
DK86826C
(en )
1959-02-02
Automatic telephone exchange.
NL189226B
(en )
TELECOMMUNICATIONS SYSTEM.
CH374104A
(en )
1963-12-31
Telecommunication system with relay-free subscriber line circuits
CH346248A
(en )
1960-05-15
Telephone system
DK107952C
(en )
1967-07-24
Automatic telephone system.
AU166622B2
(en )
1954-07-01
Improvements in or relating to devices for automatic telephone exchanges
FR70367E
(en )
1959-04-06
Automatic telephone
DK102684C
(en )
1965-09-27
Telephone subscriber device.
AU2696754A
(en )
1954-07-01
Improvements in or relating to devices for automatic telephone exchanges
FR1101230A
(en )
1955-10-04
Telephone selector
AU205869B2
(en )
1954-12-16
Improvements in automatic telephone exchange systems
AU200816B2
(en )
1955-01-13
Improvements in automatic telephone exchange equipment
AT189240B
(en )
1957-03-11
Telephone station
AT182755B
(en )
1955-08-10
Subscriber selection device for automatic switching systems, in particular telephone systems
AU96554A
(en )
1954-12-16
Improvements in automatic telephone exchange systems
AU156354A
(en )
1955-01-13
Improvements in automatic telephone exchange equipment