CH235154A
(en )
1944-11-15
Telecommunication system.
CH238063A
(en )
1945-06-15
Circuit arrangement for determining occupied lines in telecommunications systems.
CH235878A
(en )
1944-12-31
Telecommunications exchange system with at least partial voter operation.
CH205038A
(en )
1939-05-31
Rotary selector for electrical telecommunications systems.
CH206560A
(en )
1939-08-15
Circuit arrangement for telephone systems with main and sub-offices and voter operation.
CH208090A
(en )
1939-12-31
Circuit arrangement for telegraph systems with exchanges for voter operation.
CH233476A
(en )
1944-07-31
Type printing telegraph receiver.
CH205039A
(en )
1939-05-31
Circuit arrangement for telephone systems with several exchanges.
AT134445B
(en )
1933-08-10
Circuit arrangement for telegraph systems with voter operation.
CH239303A
(en )
1945-09-30
Telecommunication system.
CH203262A
(en )
1939-02-28
Circuit arrangement for telex switching systems.
FR847620A
(en )
1939-10-12
Telegraph systems
CH219815A
(en )
1942-02-28
Circuit arrangement for telephone systems with main and sub-offices and voter operation.
CH230160A
(en )
1943-12-15
Circuit arrangement for telephone exchange systems.
CH202671A
(en )
1939-01-31
Telegraph system.
AT140129B
(en )
1935-01-10
Circuit arrangement for voters in telephone systems.
CH208455A
(en )
1940-01-31
Circuit arrangement for high-frequency systems with power lines.
CH225266A
(en )
1943-01-15
Circuit arrangement for telephone systems with main and sub-offices.
CH230605A
(en )
1944-01-15
Circuit arrangement in telecommunication systems with at least partial voter operation.
FR836695A
(en )
1939-01-24
Telegraph systems
CH153049A
(en )
1932-02-29
Circuit arrangement in telephone systems.
CH213510A
(en )
1941-02-15
Circuit arrangement in teleprinter systems.
DK58803C
(en )
1941-06-30
Telegraph system.
CH205031A
(en )
1939-05-31
Telegraph system.
CH204648A
(en )
1939-05-15
Telegraph system.