CH277495A
(en )
1951-08-31
Messaging system.
CH294912A
(en )
1953-11-30
Automatic telephony installation.
NL147915B
(en )
TIME MULTIPLEXTELECOMMUNICATION CIRCUIT FOR A CONNECTION SYSTEM, ESPECIALLY A TELEPHONE SYSTEM.
CH304196A
(en )
1954-12-31
Telephone system with subscriber set.
CH276568A
(en )
1951-07-15
Subscriber circuit in an automatic telephone system.
DK80669C
(en )
1956-03-12
Signaling systems, in particular for automatic telephone systems.
ES174626A1
(en )
1946-10-01
IMPROVEMENTS IN TELEPHONE CENTRAL SYSTEMS.
CH270706A
(en )
1950-09-15
Automatic telephone system.
NL76046C
(en )
1954-10-15
Signal system, especially automatic telephone system.
CH262449A
(en )
1949-06-30
Automatic telephone system.
DK74027C
(en )
1952-04-21
Coupling to signaling systems, in particular automatic telephone systems.
DK76923C
(en )
1954-01-04
Selects, especially for automatic telephone systems.
CH273879A
(en )
1951-02-28
Crossbar switch for automatic telephone systems.
DK78682C
(en )
1955-01-03
Automatic telephone system.
DK73242C
(en )
1951-10-22
Contact device, especially selector for automatic telephone systems.
DK71003C
(en )
1950-05-15
Transmitter connection for carrier telephone systems.
DK73390C
(en )
1951-11-19
Coordinate selector for automatic telephone systems.
ES174651A1
(en )
1946-10-01
IMPROVEMENTS IN AUTOMATIC OR SEMIAUTOMATIC TELEPHONE CENTRAL SYSTEMS.
DK81610C
(en )
1956-12-10
Switching systems for establishing connections, eg in automatic telephone exchange systems.
DK78200C
(en )
1954-10-04
Signal transmission systems, in particular automatic telephone systems.
DK86025C
(en )
1958-08-11
Automatic dialing system, in particular automatic telephone or telegraph system.
DK75936C
(en )
1953-06-08
Coordinate selector for automatic telephone systems.
DK75604C
(en )
1953-03-23
Coordinate selector for automatic telephone systems.
DK75210C
(en )
1952-12-29
Coordinate selector for automatic telephone systems.
DK89108C
(en )
1960-06-07
Line selection system for automatic telephone exchanges.