AT131495B
(en )
1933-01-25
Circuit arrangement for telephone systems with dialer operation and several exchanges.
AT98628B
(en )
1924-11-25
Circuit arrangement for telephone systems with dialer operation.
CH107492A
(en )
1924-11-01
Number switch for telephone systems with dialer operation.
AT102723B
(en )
1926-03-10
Circuit arrangement for telephone systems with intermediate amplifiers.
AT103673B
(en )
1926-07-10
Telephone dialer.
AT95039B
(en )
1923-11-26
Telephone system with dialer operation.
AT94097B
(en )
1923-08-25
Telephone dialer.
AT101565B
(en )
1925-11-10
Circuit arrangement for telephone systems with through traffic.
AT95831B
(en )
1924-01-25
Counter arrangement for telephone purposes.
AT115571B
(en )
1929-12-27
Circuit arrangement for telephone systems with semi-automatic operation.
DK42778C
(en )
1930-08-18
Circuit arrangement for Private Telephone Centers with associated Private Subscriber Stations.
AT96122B
(en )
1924-02-25
Telephone switching system.
AT105732B
(en )
1927-02-25
Circuit arrangement for relay selector.
AT115431B
(en )
1929-12-27
Circuit arrangement for telephone systems with intermediate amplifiers.
AT98886B
(en )
1924-12-27
Telephone desk station.
ES85296A3
(en )
1923-07-01
Improvements in telephone systems.
ES85297A3
(en )
1923-07-01
Improvements in telephone systems.
DK37000C
(en )
1927-01-03
Telephone system.
DK38124C
(en )
1927-11-07
Telephone system.
DK39070C
(en )
1928-07-30
Telephone system.
DK34322C
(en )
1925-03-30
Automatic Telephone System.
ES80637A1
(en )
1922-05-01
Telephone station with telephonograph.
ES85630A1
(en )
1923-07-01
Improvements in telephone systems.
ES87640A1
(en )
1924-02-01
Improvements in telephone systems.
AT98619B
(en )
1924-11-25
Circuit arrangement for faradization inductors.