CH227272A
(en )
1943-05-31
Pay phone for automatic telephone systems.
CH202120A
(en )
1938-12-31
Level control circuit for television amplifiers.
AT147082B
(en )
1936-09-25
Circuit arrangement for semi-automatic telephone systems.
CH199333A
(en )
1938-08-15
Circuit arrangement for telephone networks with several groups of extensions.
CH211215A
(en )
1940-08-31
Circuit arrangement for automatic and semi-automatic telephone systems.
CH234264A
(en )
1944-09-15
Telephone system.
CH240076A
(en )
1945-11-30
Telephone switchboard.
CH230160A
(en )
1943-12-15
Circuit arrangement for telephone exchange systems.
DK58124C
(en )
1940-11-04
Fully or semi-automatic Telephone System.
DK52425C
(en )
1936-12-14
Selector circuit for fully or semi-automatic Telephone Systems or similar Systems.
DK53294C
(en )
1937-07-12
Telephone system with Selector operation.
DK53478C
(en )
1937-08-23
Telephone system with Selector operation.
CH180171A
(en )
1935-10-15
Connection terminal for rail mounting.
DK54647C
(en )
1938-04-25
Telephone system.
CH277836A
(en )
1951-09-15
Circuit arrangement in telephone systems with group dialers.
CH205039A
(en )
1939-05-31
Circuit arrangement for telephone systems with several exchanges.
CH215526A
(en )
1941-06-30
Selector stage for telecommunications exchange systems.
CH182839A
(en )
1936-02-29
Circuit arrangement for telex switching systems.
DK55113C
(en )
1938-08-22
Selector for automatic Telephone systems.
AT148657B
(en )
1937-02-25
Circuit arrangement for payphones with network group traffic.
CH186683A
(en )
1936-09-30
Self-collecting talk station.
CH191685A
(en )
1937-06-30
Telephone dial.
DK52326C
(en )
1936-10-19
Telephone set.
DK45164C
(en )
1932-02-01
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK45641C
(en )
1932-05-09
Circuit arrangement for fully or semi-automatic Telephone Systems.