CH252653A
(en )
1948-01-15
Circuit arrangement in telecommunications systems.
CH225893A
(en )
1943-02-28
Button for telecommunications, in particular telephone systems.
CH283265A
(en )
1952-05-31
Automatic telephone switchboard.
CH241318A
(en )
1946-02-28
Circuit arrangement in telephone systems with coin tellers for network group traffic.
CH274625A
(en )
1951-04-15
Telephone subscriber station.
CH233692A
(en )
1944-08-15
Circuit arrangement in telecommunication systems, in particular telephone systems.
CH235159A
(en )
1944-11-15
Circuit arrangement with pay phone for network group traffic.
CH245547A
(en )
1946-11-15
Circuit arrangement in telephone systems with several exchanges.
CH231156A
(en )
1944-02-29
Circuit arrangement in telephone systems with connecting lines equipped with several branch points.
CH266244A
(en )
1950-01-15
Two-way circuit for telephone systems.
DK73732C
(en )
1952-02-04
Signaling systems, in particular telephone systems with registers.
CH236495A
(en )
1945-02-15
Payphones, in particular for network group traffic.
CH228350A
(en )
1943-08-15
Circuit arrangement for counting connections of different values in telecommunications, in particular telephone systems.
CH258725A
(en )
1948-12-15
Remote switchable self-connection telephone for noisy traffic.
CH225671A
(en )
1943-02-15
Circuit arrangement in telephone systems, in particular private branch exchanges, with several centers.
CH237889A
(en )
1945-05-31
Circuit arrangement in telephone systems with main and sub-offices.
CH240685A
(en )
1946-01-15
Subscriber call facility in electro-acoustic transmission systems.
CH237098A
(en )
1945-03-31
Circuit arrangement in telephone systems with several exchanges in series.
CH243484A
(en )
1946-07-15
Circuit arrangement in telephone systems with several exchanges in series.
CH226576A
(en )
1943-04-15
Circuit arrangement for counting connections of different values in telecommunications, in particular 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.
CH234468A
(en )
1944-09-30
Circuit arrangement in telephone systems with dialer operation.
CH244726A
(en )
1946-09-30
Circuit arrangement in telephone subscriber sets.
CH236137A
(en )
1945-01-15
Circuit arrangement in telephone networks with several exchanges in series.