FR1086767A
(en )
1955-02-16
Telecommunications installation
CH329940A
(en )
1958-05-15
Automatic telephone installation
AT174090B
(en )
1953-02-25
Circuit arrangement for telephone systems with direct dialing
CH315749A
(en )
1956-08-31
Circuit arrangement for subscriber telephone station
CH313271A
(en )
1956-03-31
Circuit arrangement for an automatic telephone system
CH315053A
(en )
1956-07-15
Circuit arrangement in telecommunication systems, in particular telephone systems
AT174089B
(en )
1953-02-25
Circuit arrangement for telephone systems with sub-exchanges
AT181636B
(en )
1955-04-12
Circuit arrangement for telephone extension systems with dialer operation
AT185410B
(en )
1956-04-25
Circuit arrangement for telephone extension systems with dialer operation
CH330331A
(en )
1958-05-31
Automatic telephone installation
AT174955B
(en )
1953-05-26
Circuit arrangement for multiple telephones
AT190105B
(en )
1957-06-11
Circuit arrangement for telephone systems with direct remote dialing
CH320152A
(en )
1957-03-15
Circuit arrangement with reversing device for telecommunications systems
AT173486B
(en )
1952-12-27
Circuit arrangement in telephone systems with group dialers
CH311994A
(en )
1955-12-15
Circuit arrangement for telex extension systems with dialer operation.
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
AT177811B
(en )
1954-03-10
Circuit arrangement for subscriber connection devices in automatic telephone switching systems
CH319080A
(en )
1957-01-31
Circuit arrangement for telephone systems with call seekers
AT188765B
(en )
1957-02-11
Circuit arrangement for telephone systems with two-way connections
AT199229B
(en )
1958-08-25
Circuit arrangement for telephone systems
CH313882A
(en )
1956-05-15
Circuit arrangement for telecommunications systems, in particular for telephone systems with dialer operation
AT179569B
(en )
1954-09-10
Circuit arrangement for an automatic telephone system
CH302752A
(en )
1954-10-31
Circuit arrangement for telephone systems with main and sub-offices.
AT182136B
(en )
1955-05-25
Switching system and circuit arrangement for telephone systems with dialer operation