AT23616B
(en )
1906-03-26
Circuit arrangement for telephone systems with main and secondary units.
AT75596B
(en )
1919-02-25
Circuit arrangement for telephone systems with call seekers.
AT43909B
(en )
1910-09-10
Circuit arrangement for automatic telephone systems.
AT23760B
(en )
1906-04-10
Circuit arrangement for telephone systems with secondary microphone batteries at the participants.
DK7456C
(en )
1905-04-17
Telephone system with Group Stations.
AT62699B
(en )
1913-12-27
Circuit arrangement for automatic telephone systems.
CH35512A
(en )
1906-09-15
Central office switch for telephone systems
AT25137B
(en )
1906-07-25
Station indicator.
DK7240C
(en )
1905-01-23
Device for Group Line Telephone Systems.
CH33520A
(en )
1905-12-15
Signaling device for telephone stations
AT71121B
(en )
1916-02-10
Circuit arrangement for telephone systems operated with voters.
DK7239C
(en )
1905-01-23
Central switching device for Telephone Systems.
AT23120B
(en )
1906-02-26
Station indicator.
AT43518B
(en )
1910-08-10
Circuit arrangement for automatic telephone exchanges.
AT55320B
(en )
1912-09-10
Circuit arrangement for automatic telephone exchanges.
AT42557B
(en )
1910-06-10
Circuit arrangement for external traffic in automatic telephone systems.
AT66318B
(en )
1914-08-25
Circuit arrangement for automatic switches in telephone exchanges.
AT73145B
(en )
1917-02-26
Circuit arrangement for telephone systems with ordinary extensions and extensions with state connection.
DK7259C
(en )
1905-01-30
Device by Telephone Systems.
AT25884B
(en )
1906-10-10
Circuit arrangement for securing signaling in the event of a line break in electrical signal systems.
FR4091E
(en )
1905-05-22
Telephone receiver
AT80136B
(en )
1920-02-25
Circuit arrangement for telephone systems. Circuit arrangement for telephone systems.
AT23775B
(en )
1906-04-10
Intercom.
AT33190B
(en )
1908-06-10
Multiple telegraph system for undulating currents.
ES36954A1
(en )
1905-12-01
An automatic-regulator-oiler.