CH331072A
(en )
1958-06-30
Circuit arrangement for a subscriber line in an automatic telephone exchange
CH343462A
(en )
1959-12-31
Telephone subscriber set
IE22150L
(en )
1955-06-03
Automatic telecommunication exchanges.
DK82651C
(en )
1957-04-08
Subscriber line connection in automatic telephone exchanges.
AU200816B2
(en )
1955-01-13
Improvements in automatic telephone exchange equipment
AU203055B2
(en )
1954-11-11
Improvements in or relating to subscriber billing in automatic telecommunication exchange systems andthe like
CA502772A
(en )
1954-05-18
Automatic telephone billing system
AU205869B2
(en )
1954-12-16
Improvements in automatic telephone exchange systems
AU156354A
(en )
1955-01-13
Improvements in automatic telephone exchange equipment
AU12254A
(en )
1954-11-11
Improvements in or relating to subscriber billing in automatic telecommunication exchange systems andthe like
AU166622B2
(en )
1954-07-01
Improvements in or relating to devices for automatic telephone exchanges
AU96554A
(en )
1954-12-16
Improvements in automatic telephone exchange systems
AU166693B2
(en )
1954-05-20
Party-line metering in automatic telephone exchange systems
AU2696754A
(en )
1954-07-01
Improvements in or relating to devices for automatic telephone exchanges
DK86826C
(en )
1959-02-02
Automatic telephone exchange.
AU212265B2
(en )
1956-05-31
Improvements in or relating to automatic telecommunication exchanges
AU215124B2
(en )
1957-04-04
Improvements in automatic telephone exchanges
AU2589654A
(en )
1954-05-20
Party-line metering in automatic telephone exchange systems
AU204191B2
(en )
1955-02-10
Improvements in automatic and semiautomatic telephone systems
AU1258055A
(en )
1956-05-31
Improvements in or relating to automatic telecommunication exchanges
AU214654A
(en )
1955-02-10
Improvements in automatic and semiautomatic telephone systems
CA518783A
(en )
1955-11-22
Automatic telecommunication exchanges
IE22220L
(en )
1956-04-05
Automatic telecommunication exchange
AU204380B2
(en )
1956-06-21
Improvements in private automatic exchanges
AU202489B2
(en )
1955-03-31
Improvements relating to metering in automatic telephone systems