|
GB207449A
|
|
Improvements in or relating to long distance telephony
|
|
GB207450A
|
|
Improvements in or relating to long distance telephony
|
|
GB201865A
|
|
A system of long distance telephony
|
|
GB203274A
|
|
A system of long distance telephony
|
|
GB205018A
|
|
Improvements in or relating to multi-core cables for long distance telephony
|
|
US1475878A
|
|
Multiple-wire cable for high-frequency telephony and telegraphy
|
|
GB211697A
|
|
Improvements in or relating to multi-core cables for high frequency telephony or telegraphy
|
|
US1495926A
|
|
Submarine and long-distance telephone system and method of operating the same
|
|
GB165793A
|
|
Improvements in or relating to systems of long distance telephony
|
|
GB136162A
|
|
Improvements in or relating to Thermic Telephone Systems.
|
|
DE340793C
|
|
Microphone in which the sound waves are directed from the edge of the membrane into the sound chamber
|
|
GB123728A
|
|
Improvements in or relating to Apparatus for Use in the Manufacture of Thermic Telephones or Microphones.
|
|
GB123727A
|
|
Improvements in or relating to Thermic Telephones or like Electrical Apparatus Provided with Heating Conductors.
|
|
GB118600A
|
|
Improvements in or relating to Wireless Telegraphy or Telephony.
|
|
GB123255A
|
|
Improvements in or relating to Thermic Telephones.
|
|
GB114418A
|
|
Improvements in or relating to Thermic Telephones and Microphones.
|
|
GB109797A
|
|
Improvements in or relating to the Heating Conductors of Thermic Telephones.
|
|
DE323737C
|
|
Electromagnetic friction clutch
|
|
GB108871A
|
|
Improvements in or relating to Electrically Controlled Clutches.
|
|
GB100084A
|
|
Improvements in or relating to Thermic Telephones.
|
