CH265359A
(en )
1949-11-30
Frequency-keyed telegraph transmitter.
CH270139A
(en )
1950-08-15
Pressure telegraph receiver.
DK70399C
(en )
1949-12-27
Coupling for transmitting calls in message transmission systems, in particular with several carrier frequency channels.
DK70361C
(en )
1949-12-19
Coupling for transmission of operating modes for large groups of message channels in carrier frequency systems.
DK68719C
(en )
1949-03-14
Coupling for Transmission of Operating Modes for Large Groups of Message Channels in Carrier Frequency Systems.
CH264460A
(en )
1949-10-15
Multi-channel carrier power transmission system.
DK68943C
(en )
1949-04-19
Receiving connection for carrier frequency telegraph systems with variable level.
DK68161C
(en )
1948-12-20
Signal receiver, in particular call receiver for carrier frequency systems.
DK78200C
(en )
1954-10-04
Signal transmission systems, in particular automatic telephone systems.
DK67763C
(en )
1948-10-11
Coupling for transmitting high-frequency electrical oscillations.
CH241315A
(en )
1946-02-28
Transmission system with several repeaters.
DK68887C
(en )
1949-04-11
Coupling for transmission of telegraph characters in variable frequency telegraph systems.
DK76817C
(en )
1953-12-14
Automatic telephone exchange system with party subscriber stations.
DK64625C
(en )
1946-07-15
Coupling at Pipe Transmitters for Telegraphy.
DK73613C
(en )
1952-01-07
Receiver for electrical transmission system.
DK65360C
(en )
1947-01-27
High frequency transmission line.
IE19214L
(en )
1945-04-29
Telecommunication exchange systems.
DK71857C
(en )
1950-12-18
Switching systems, eg for automatic telephone exchange systems.
DK71727C
(en )
1950-11-20
Mixing coupling, especially for short waves.
DK74603C
(en )
1952-08-25
Coupling for the transmission of special signals, eg call signals, in systems in which time-modulated pulses are used.
IE16712L
(en )
1945-02-28
Telephone exchange systems.
IE16713L
(en )
1945-02-28
Telephone exchange systems.
DK83104C
(en )
1957-07-15
Coupling with multi-channel message transmission system.
IE18908L
(en )
1945-08-24
Automatic telephone exchange systems.
IE18961L
(en )
1945-08-05
Automatic telephone exchange systems.