CH235154A
(en )
1944-11-15
Telecommunication system.
FR902622A
(en )
1945-09-05
Line identifier circuits for telephone systems
CH238063A
(en )
1945-06-15
Circuit arrangement for determining occupied lines in telecommunications systems.
CH193481A
(en )
1937-10-15
Device for time and zone counting in telecommunications systems.
AT140822B
(en )
1935-02-25
Circuit arrangement for counting connections of different values in telephone systems.
AT131949B
(en )
1933-02-25
Circuit arrangement for time counting connections of different values in telephone installations.
CH194900A
(en )
1937-12-31
Telephone receiver.
AT102649B
(en )
1926-02-25
Circuit arrangement for counting connections of different values in telephone systems.
CH228350A
(en )
1943-08-15
Circuit arrangement for counting connections of different values in telecommunications, in particular telephone systems.
AT105744B
(en )
1927-02-25
Arrangement for counting connections of different values in telephone systems.
CH239303A
(en )
1945-09-30
Telecommunication system.
CH234264A
(en )
1944-09-15
Telephone system.
CH226576A
(en )
1943-04-15
Circuit arrangement for counting connections of different values in telecommunications, in particular telephone systems.
CH124447A
(en )
1928-02-01
Circuit arrangement for zone time counting of different-valued interurban connections in telephone systems.
CH153049A
(en )
1932-02-29
Circuit arrangement in telephone systems.
CH202671A
(en )
1939-01-31
Telegraph system.
CH234895A
(en )
1944-10-31
Circuit arrangement for the determination of participants in telecommunication systems.
CH203269A
(en )
1939-02-28
Method for establishing connections in telephone systems with payphones.
AT129580B
(en )
1932-08-25
Circuit arrangement for establishing connections in automatic or semi-automatic telephone systems.
CH212745A
(en )
1940-12-15
Circuit for call transmission.
DK54647C
(en )
1938-04-25
Telephone system.
AT140129B
(en )
1935-01-10
Circuit arrangement for voters in telephone systems.
DK48697C
(en )
1934-04-30
Telephone system.
AT121433B
(en )
1931-02-25
Circuit arrangement for counting the conversation time in self-connecting telephone systems.
GR6959B
(en )
1937-11-20
AUTOMATIC INTERNAL TELEPHONE SYSTEM WITHOUT CENTER.