DK22255C
(en )
1917-07-09
Selector for Making Connections in Telephone Systems.
DK19355C
(en )
1914-10-12
Selector for Making Connections in Telephone Systems.
DK19678C
(en )
1915-01-04
Telephone system.
DK33212C
(en )
1924-05-12
Telephone system with Group selector setting.
DK23466C
(en )
1918-09-02
Selector for Making Connections in Telephone Systems.
GB101047A
(en )
1916-09-11
Improvements in Automatic Telephone Systems.
GB103116A
(en )
1917-06-07
Improvements in Automatic Telephone Systems.
GB100941A
(en )
1916-09-28
Improvements in Telephone Systems.
GB103880A
(en )
1917-02-15
Improvements in Telephone Systems.
AT80094B
(en )
1920-02-25
Semi-automatic telephone system. Semi-automatic telephone system.
DK20140C
(en )
1915-05-03
Selector switch for Telephone Systems.
GB104164A
(en )
1917-06-07
Improvements in or relating to Automatic Telephone Systems.
GB104640A
(en )
1917-03-15
Improvements in or relating to Automatic Telephone Systems.
AT82832B
(en )
1921-02-25
Telephone switching system.
DK34938C
(en )
1925-08-31
Telephone system.
GB104171A
(en )
1917-08-09
Improvements in Automatic Telephone Systems.
GB109829A
(en )
1917-09-24
Improvements in Automatic Telephone Systems.
GB109830A
(en )
1917-09-24
Improvements in Automatic Telephone Systems.
DK20281C
(en )
1915-06-28
Telephone system in which the Connections are made Using Automatic Dialers.
DK19847C
(en )
1915-02-15
Telephone systems in which the Connections are made Using Automatic Dialers.
ES61164A1
(en )
1915-12-01
Improvements in telegraphy.
DK32848C
(en )
1924-02-11
Telephone exchange system.
DK20075C
(en )
1915-04-12
Connecting device for Part subscribers in Telephone systems.
GB102680A
(en )
1916-12-21
Improvements in Telephone Systems.
GB103732A
(en )
1917-02-08
Improvements in Telephone Systems.