CH207043A
(en )
1939-09-15
Pressure telegraph receiver.
DK58066C
(en )
1940-10-14
Coupling device for Relay transmitters in Telegraph systems.
CH233477A
(en )
1944-07-31
Send contact device for telegraph transmitter.
CH234264A
(en )
1944-09-15
Telephone system.
CH200864A
(en )
1938-10-31
Television transmission system.
DK50345C
(en )
1935-06-17
Coupling device for automatic Telephone systems.
CH202671A
(en )
1939-01-31
Telegraph system.
DK57511C
(en )
1940-04-22
Coupling device at Telegraph system.
DK53820C
(en )
1937-11-08
Coupling device at railway safety system.
DK54277C
(en )
1938-02-07
Signal transmission system.
DK53891C
(en )
1937-11-22
Trovejs Telephone Transmission System or Amplifier System.
DK51893C
(en )
1936-07-20
Coupling device at Telegraph transmission system.
DK53758C
(en )
1937-10-25
Coupling device for Telephone systems with Main and Sub-exchanges.
ES139145A1
(en )
1935-11-01
An elastic transmission system.
DK58726C
(en )
1941-06-03
Telegraph selector system.
DK56994C
(en )
1939-12-04
Coupling device for Remote Printing System with Selector operation.
IE12872L
(en )
1933-02-28
Communication systems.
ES130133A1
(en )
1933-05-16
A new communication system.
DK53727C
(en )
1937-10-18
Overlay receiver coupling.
DK51369C
(en )
1936-03-09
Device for Impulse Transmitters.
DK58803C
(en )
1941-06-30
Telegraph system.
CH204648A
(en )
1939-05-15
Telegraph system.
CH205031A
(en )
1939-05-31
Telegraph system.
CH204086A
(en )
1939-04-15
Telegraph system.
CH203263A
(en )
1939-02-28
Telegraph system.