CH301275A
(en )
1954-08-31
Telecommunications exchange system.
CH277494A
(en )
1951-08-31
Automatic telecommunications switchgear.
CH271002A
(en )
1950-09-30
Telecommunication switchgear.
CH274392A
(en )
1951-03-31
Telecommunications exchange system.
CH276285A
(en )
1951-06-30
Subscriber telephone set circuit.
CH304196A
(en )
1954-12-31
Telephone system with subscriber set.
CH276568A
(en )
1951-07-15
Subscriber circuit in an automatic telephone system.
CH258467A
(en )
1948-11-30
Circuit arrangement for establishing connections in automatic telecommunications network groups.
CH297628A
(en )
1954-03-31
Subscriber circuit for call seekers.
CH266251A
(en )
1950-01-15
Mixed circuit.
ES174626A1
(en )
1946-10-01
IMPROVEMENTS IN TELEPHONE CENTRAL SYSTEMS.
CH276281A
(en )
1951-06-30
Telecommunication system.
CH270706A
(en )
1950-09-15
Automatic telephone system.
CH285955A
(en )
1952-09-30
Switching device for establishing connections in telecommunications systems.
FR942611A
(en )
1949-02-14
Resinous compounds, in particular polymeric silicones
CH262449A
(en )
1949-06-30
Automatic telephone system.
CH232003A
(en )
1944-04-30
Circuit arrangement for establishing connections in telephone networks with several offices behind one another.
CH231131A
(en )
1944-02-29
Electrical terminal block.
CH275986A
(en )
1951-06-15
Telecommunications exchange system.
ES171654A1
(en )
1945-12-16
IMPROVEMENTS IN SUBSCRIBER TELEPHONE APPLIANCES.
DK78682C
(en )
1955-01-03
Automatic telephone system.
DK75096C
(en )
1952-12-08
Coupling for counting electrical impulses.
DK70599C
(en )
1950-02-06
Electrical system for connecting and disconnecting electrical circuits.
CH269352A
(en )
1950-06-30
Telecommunication system.
DK91326C
(en )
1961-07-17
Automatic telephone exchange with subscriber circuits.