|
US2997533A
|
|
Automatic telegraph message numbering apparatus
|
|
US2984753A
|
|
Transistor ring counter
|
|
GB818989A
|
|
Telegraph code converter
|
|
US2847503A
|
|
Telegraph code converter
|
|
GB555029A
|
|
Submarine cable signalling system
|
|
US2328789A
|
|
Submarine cable signaling system
|
|
US2118069A
|
|
Telegraph signal regenerating apparatus
|
|
US2141237A
|
|
Electric telegraphy
|
|
ES111609A1
|
|
An artificial inductive line.
|
|
US1811368A
|
|
Telegraph system
|
|
US1679852A
|
|
Synchronizing system
|
|
US1643713A
|
|
Method of and apparatus for amplifying electric signal impulses
|
|
US1597683A
|
|
Method of and apparatus for electrical signaling
|
|
US1657396A
|
|
Method of and apparatus for amplifying electric signal impulses
|
|
US1542860A
|
|
Cable telegraphy
|
|
US1548757A
|
|
Electron-discharge device
|
|
US1122383A
|
|
Working submarine cables.
|
|
US1114982A
|
|
Working submarine cables.
|
|
US1119117A
|
|
Telegraph transmitting system.
|
|
US1109830A
|
|
Quadruplex telegraph system.
|
