The Telephone Exchange (1982) British Telecom Schools Film
17:12
BT Educational Service - call routing from UK to Australia
16:19
End of an Era | BT Heritage
23:44
Electromechanical switching methods for telephone exchanges Part 2
24:29
CARW: Bell's Nuclear-War Telephone Network
26:40
Original 1956 RCA Film: Vintage Television Electronics & Vacuum Tube Production, TV technology
23:56
Building A 1960's Electromechanical Telephone Exchange For People To Use
14:28
The Coming of the Dial (1933)
22:38