AT101565B
(en )
1925-11-10
Circuit arrangement for telephone systems with through traffic.
FR593368A
(en )
1925-08-21
Selective signaling circuits
ES87916A2
(en )
1924-04-01
Improvements in telephone link systems.
AT102723B
(en )
1926-03-10
Circuit arrangement for telephone systems with intermediate amplifiers.
AT115431B
(en )
1929-12-27
Circuit arrangement for telephone systems with intermediate amplifiers.
ES86252A1
(en )
1923-10-16
Improvements in telephone link systems.
AT114004B
(en )
1929-08-26
Circuit arrangement for telephone systems with main and sub-exchanges.
AT126865B
(en )
1932-02-25
Circuit arrangement for automatic telephone systems.
AT134445B
(en )
1933-08-10
Circuit arrangement for telegraph systems with voter operation.
ES91218A3
(en )
1924-12-01
Improvements in telephone systems.
ES89606A1
(en )
1924-08-16
Improvements in telephone systems.
ES92022A1
(en )
1925-04-16
Improvements in fast telegraphy systems.
AT98628B
(en )
1924-11-25
Circuit arrangement for telephone systems with dialer operation.
ES89513A1
(en )
1924-08-01
Improvements in communication systems.
AT108963B
(en )
1928-02-25
Circuit arrangement for telephone systems in series connection.
ES88677A3
(en )
1924-04-16
Improvements in telephone exchange systems.
ES91523A1
(en )
1925-01-16
Improvements in telephone exchange systems.
ES90994A1
(en )
1924-11-16
Improvements in telephone exchange systems.
ES90841A1
(en )
1925-01-16
Improvements in telephone exchange systems.
ES90588A1
(en )
1925-04-16
Improvements in telephone exchange systems.
AT121482B
(en )
1931-02-25
Circuit arrangement for telephone systems.
DK35360C
(en )
1925-12-07
Automatic Telephone System.
ES87057A1
(en )
1923-12-01
Improvements in telephone systems with automatic standard.
CH105340A
(en )
1924-06-16
Time switch device for lighting systems.
DK36613C
(en )
1926-10-04
Electrical Signaling System.