CH291949A
(en )
1953-07-15
Circuit for telephone systems for receiving signals.
FR1109009A
(en )
1956-01-20
Telephone circuit
CH324915A
(en )
1957-10-15
Circuit arrangement for telecommunications, in particular telephone systems
AT168002B
(en )
1951-04-10
Circuit arrangement for line selectors in telephone systems
CH298346A
(en )
1954-04-30
Equipment for telecommunications exchange.
CH315053A
(en )
1956-07-15
Circuit arrangement in telecommunication systems, in particular telephone systems
AT173488B
(en )
1952-12-27
Circuit arrangement for sub-exchanges in telephone systems with dialer operation
AT170194B
(en )
1952-01-25
Circuit arrangement for sub-exchanges in telephone systems with dialer operation
CH317711A
(en )
1956-11-30
Multiple switches for telecommunication systems, in particular telephone systems
AT172816B
(en )
1952-10-25
Circuit arrangement for company lines in telecommunications, in particular telephone systems
CH314163A
(en )
1956-05-31
Selector switches for telecommunication systems, in particular telephone systems
AT178652B
(en )
1954-06-10
Circuit arrangement for line selectors
AT173486B
(en )
1952-12-27
Circuit arrangement in telephone systems with group dialers
AT169750B
(en )
1951-12-10
Circuit arrangement for telephone private branch exchanges
CH320152A
(en )
1957-03-15
Circuit arrangement with reversing device for telecommunications systems
AT171625B
(en )
1952-06-25
Switching device for automatic telephone systems
AT169525B
(en )
1951-11-26
Hybrid circuit for telegraph systems
CH272116A
(en )
1950-11-30
Circuit arrangement in small telephone centers.
AT173737B
(en )
1953-01-26
Rotary selector for telecommunication systems, in particular telephone systems
AT171124B
(en )
1952-04-25
Circuit arrangement for transmissions, in particular for alternating current transmissions in telecommunications systems
CH288080A
(en )
1952-12-31
Switching device, in particular for periodic switching.
AT174089B
(en )
1953-02-25
Circuit arrangement for telephone systems with sub-exchanges
AT169276B
(en )
1951-10-25
Switchboard for telephone exchanges
CH309051A
(en )
1955-08-15
Circuit arrangement for line selectors in telecommunications systems, in particular in telephone systems.
AT171112B
(en )
1952-04-25
Rotary selector for automatic telephone systems