|
GB190503913A
|
|
Improvements relating to Apparatus for Enabling Telephonic and Telegraphic Messages to be Transmitted over the same line.
|
|
US801936A
|
|
Apparatus for the simultaneous transmission of telephonic and telegraphic currents over the same line.
|
|
GB190412691A
|
|
Improvements in Apparatus for the Simultaneous Transmission of Telephonic and Telegraphic or other Currents over the same Line.
|
|
CA88561A
|
|
Telephonic and telegraphic transmitting apparatus
|
|
US797761A
|
|
Composite telegraph and telephone system.
|
|
US809865A
|
|
Combined telegraph and telephone system.
|
|
GB190307585A
|
|
Improvements in Apparatus for Enabling Telephonic and Telegraphic Messages to be Transmitted Over the same Line.
|
