CH291949A
(en )
1953-07-15
Circuit for telephone systems for receiving signals.
CH329942A
(en )
1958-05-15
Circuit arrangement for free selection processes in telecommunication systems, in particular telephone systems
CH324915A
(en )
1957-10-15
Circuit arrangement for telecommunications, in particular telephone systems
FR1116599A
(en )
1956-05-09
Blocking circuits
CH302753A
(en )
1954-10-31
Test and blocking circuit for voters in telecommunications systems
CH299543A
(en )
1954-06-15
Impulse contact for dials and impulse devices.
CH302752A
(en )
1954-10-31
Circuit arrangement for telephone systems with main and sub-offices.
CH315053A
(en )
1956-07-15
Circuit arrangement in telecommunication systems, in particular telephone systems
CH313271A
(en )
1956-03-31
Circuit arrangement for an automatic telephone system
AT180965B
(en )
1955-02-10
Contact field for voters in telecommunications systems, especially telephone systems
AT173486B
(en )
1952-12-27
Circuit arrangement in telephone systems with group dialers
CH309049A
(en )
1955-08-15
Circuit arrangement in telephone systems with main and sub-offices.
CH317711A
(en )
1956-11-30
Multiple switches for telecommunication systems, in particular telephone systems
AT175294B
(en )
1953-06-25
Security device for telecommunication and signaling systems
DE1633804U
(en )
1952-01-24
SHORT CIRCUIT TEST DEVICE.
AT171124B
(en )
1952-04-25
Circuit arrangement for transmissions, in particular for alternating current transmissions in telecommunications systems
CH313884A
(en )
1956-05-15
Circuit arrangement for limiting the test time in telecommunication systems with dialer operation, especially in telephone systems
CH320152A
(en )
1957-03-15
Circuit arrangement with reversing device for telecommunications systems
CH336464A
(en )
1959-02-28
Voting devices, in particular for television purposes
CH302751A
(en )
1954-10-31
Circuit arrangement for telephone systems with community connections.
AT173738B
(en )
1953-01-26
Selector device for telecommunications systems
AT174089B
(en )
1953-02-25
Circuit arrangement for telephone systems with sub-exchanges
AT192464B
(en )
1957-10-25
Circuit arrangement and device for conference systems
AT170194B
(en )
1952-01-25
Circuit arrangement for sub-exchanges in telephone systems with dialer operation
AT173488B
(en )
1952-12-27
Circuit arrangement for sub-exchanges in telephone systems with dialer operation