FR941331A
(en )
1949-01-07
Telephone circuits
CH263436A
(en )
1949-08-31
Circuit arrangement with a call finder.
CH252653A
(en )
1948-01-15
Circuit arrangement in telecommunications systems.
CH283265A
(en )
1952-05-31
Automatic telephone switchboard.
CH237099A
(en )
1945-03-31
Circuit arrangement in telephone systems with several exchanges that can be switched in series.
CH226354A
(en )
1943-03-31
Arrangement in telephone 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.
CH234897A
(en )
1944-10-31
Circuit arrangement in telephone systems with several exchanges that can be switched in series.
CH245547A
(en )
1946-11-15
Circuit arrangement in telephone systems with several exchanges.
CH236137A
(en )
1945-01-15
Circuit arrangement in telephone networks with several exchanges in series.
CH231156A
(en )
1944-02-29
Circuit arrangement in telephone systems with connecting lines equipped with several branch points.
CH276282A
(en )
1951-06-30
Telecommunications exchange system.
CH233692A
(en )
1944-08-15
Circuit arrangement in telecommunication systems, in particular telephone systems.
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.
CH231803A
(en )
1944-04-15
Circuit arrangement in telephone systems with preset mixed selectors.
CH231157A
(en )
1944-02-29
Circuit arrangement in telephone systems with connecting lines provided with several branch points.
CH241312A
(en )
1946-02-28
Telephone set.
CH234468A
(en )
1944-09-30
Circuit arrangement in telephone systems with dialer operation.
CH236136A
(en )
1945-01-15
Circuit arrangement in telephone systems with separate setting and speech paths.
CH241319A
(en )
1946-02-28
Circuit arrangement in telephone systems with dialer operation.
CH237705A
(en )
1945-05-15
Circuit arrangement for the matching setting of locally separated switchgear in telecommunications, in particular telephone systems with main and sub-offices.
CH244726A
(en )
1946-09-30
Circuit arrangement in telephone subscriber sets.
CH238420A
(en )
1945-07-15
Test circuitry in electrical telecommunications systems.