CH194293A
(en )
1937-11-30
Receive circuit.
AT131495B
(en )
1933-01-25
Circuit arrangement for telephone systems with dialer operation and several exchanges.
AT140129B
(en )
1935-01-10
Circuit arrangement for voters in telephone systems.
CH206560A
(en )
1939-08-15
Circuit arrangement for telephone systems with main and sub-offices and voter operation.
CH188134A
(en )
1936-12-15
Contact arrangement for switches.
CH153049A
(en )
1932-02-29
Circuit arrangement in telephone systems.
AT134445B
(en )
1933-08-10
Circuit arrangement for telegraph systems with voter operation.
CH277836A
(en )
1951-09-15
Circuit arrangement in telephone systems with group dialers.
CH182839A
(en )
1936-02-29
Circuit arrangement for telex switching systems.
CH153048A
(en )
1932-02-29
Circuit arrangement in telephone systems.
CH205039A
(en )
1939-05-31
Circuit arrangement for telephone systems with several exchanges.
AT131950B
(en )
1933-02-25
Circuit arrangement for telephone systems with several offices in series.
CH208090A
(en )
1939-12-31
Circuit arrangement for telegraph systems with exchanges for voter operation.
CH230160A
(en )
1943-12-15
Circuit arrangement for telephone exchange systems.
AT147082B
(en )
1936-09-25
Circuit arrangement for semi-automatic telephone systems.
AT136923B
(en )
1934-03-26
Circuit arrangement for intermediate switch switches in connection with voter offices.
AT136593B
(en )
1934-02-26
Circuit arrangement for group stations.
AT108963B
(en )
1928-02-25
Circuit arrangement for telephone systems in series connection.
CH230605A
(en )
1944-01-15
Circuit arrangement in telecommunication systems with at least partial voter operation.
AT136509B
(en )
1934-02-10
Circuit arrangement for company lines.
DK53928C
(en )
1937-11-29
Telephone system.
ES87057A1
(en )
1923-12-01
Improvements in telephone systems with automatic standard.
AT140695B
(en )
1935-02-25
Telephone set for house traffic.
AT131859B
(en )
1933-02-25
Circuit arrangement for voters in automatic or semi-automatic telephone exchanges.
AT126814B
(en )
1932-02-10
Circuit arrangement for automatic and semi-automatic telephone systems.