CH252653A
(en )
1948-01-15
Circuit arrangement in telecommunications systems.
CH267007A
(en )
1950-02-28
Telephone set.
CH226354A
(en )
1943-03-31
Arrangement in telephone systems.
CH244782A
(en )
1946-09-30
Circuit arrangement for telephone systems with main and sub-offices.
CH226358A
(en )
1943-03-31
Circuit arrangement for telephone systems with main and sub-offices.
CH206560A
(en )
1939-08-15
Circuit arrangement for telephone systems with main and sub-offices and voter operation.
CH225266A
(en )
1943-01-15
Circuit arrangement for telephone systems with main and sub-offices.
CH228776A
(en )
1943-09-15
Circuit arrangement in telephone systems with main and sub-offices.
CH234468A
(en )
1944-09-30
Circuit arrangement in telephone systems with dialer operation.
CH219815A
(en )
1942-02-28
Circuit arrangement for telephone systems with main and sub-offices and voter operation.
ES148401A1
(en )
1942-05-01
IMPROVEMENTS IN TELEPHONE SYSTEMS
CH226574A
(en )
1943-04-15
Circuit arrangement for telephone systems with dialer operation.
CH224320A
(en )
1942-11-15
Circuit arrangement for command intercom loudspeaker system.
DK62184C
(en )
1944-04-24
Connecting device for Telephone systems with Main and Sub-exchanges.
CH222909A
(en )
1942-08-15
Circuit arrangement for telex extension systems with dialer operation.
DK71587C
(en )
1950-10-16
Telephone system.
DK71786C
(en )
1950-12-04
Telephone system.
DK72131C
(en )
1951-02-12
Telephone system.
CH289545A
(en )
1953-03-15
Telecommunications installation.
CH226796A
(en )
1943-04-30
Circuit arrangement in telephone systems with dialer operation.
CH225935A
(en )
1943-02-28
Circuit arrangement in telephone systems with dialer operation.
CH266244A
(en )
1950-01-15
Two-way circuit for telephone systems.
CH222911A
(en )
1942-08-15
Circuit arrangement for command intercom loudspeaker systems.
CH231803A
(en )
1944-04-15
Circuit arrangement in telephone systems with preset mixed selectors.
CH225851A
(en )
1943-02-28
Injector.