CH51869A
(en )
1911-10-16
Installation to automatically establish communication between two subscribers of a telephone network at the central office
CH41063A
(en )
1908-09-16
Installation to automatically establish communication between two subscribers of a telephone network at the central office
CH36229A
(en )
1906-12-31
Installation to automatically establish communication between two subscribers of a telephone network at the central office
CH33515A
(en )
1905-12-31
Installation to automatically establish communication between two subscribers of a telephone network at the central office
FR10892E
(en )
1909-10-21
Device for automatically establishing communication between two subscribers of a telephone network at the central office
FR349757A
(en )
1905-06-12
Device for automatically establishing communication between two subscribers of a telephone network at the central office
FR5515E
(en )
1906-05-02
Device for automatically establishing, at the central office, communication between two subscribers of a telephone network
CH10532A
(en )
1896-01-31
PBX allowing telephone communications between subscribers of a network, without the intermediary of special employees
CH51546A
(en )
1911-09-01
Telephone booth
FR426643A
(en )
1911-07-11
Device for telephoning, telegraphing or signaling by using the same network for the transmission or distribution of electric energy
FR450235A
(en )
1913-03-19
Improvements in switching devices for interconnection of lines in a telephone network
FR452368A
(en )
1913-05-15
Telephone network system
FR476042A
(en )
1915-07-07
Improvements in establishing telephone communications between the automatic network and a manual line
FR5764E
(en )
1906-10-01
Central battery telephone network
FR451148A
(en )
1913-04-11
Telephone network system
FR367612A
(en )
1906-11-06
Switch giving, automatically, to the central office, telephone communication
AU937613B
(en )
1914-07-07
Supervisory signalling' devices ina semiautomatic telephone system
FR454414A
(en )
1913-07-04
Box to receive the list of subscribers by telephone
FR450234A
(en )
1913-03-19
Improvements in switching devices for interconnection of lines in a telephone network
FR417705A
(en )
1910-11-21
PBXs for central telephone offices
FR399470A
(en )
1909-06-29
Arrangement for telephone offices with end of conversation signaling by a relay permanently placed in the subscriber's line
AU634312B
(en )
1913-04-15
Call distributing" telephone system
CA113400A
(en )
1908-08-04
Telephone relay
FR366816A
(en )
1906-10-12
Intercom system for central telephone offices
CH68409A
(en )
1915-03-16
Installation for the distribution of motive power to the switches of a telephone network