The Telephone Exchange (1982) British Telecom Schools Film
1:40:10
The Line Finder In The Step-By-Step Telephone Switching System
17:12
BT Educational Service - call routing from UK to Australia
22:28
”THE TELEPHONE EXCHANGE” 1982 BRITISH TELECOMMUNICATIONS DOCUMENTARY MONDIAL HOUSE XD47854
16:19
End of an Era | BT Heritage
26:40
Original 1956 RCA Film: Vintage Television Electronics & Vacuum Tube Production, TV technology
16:47
Multiply and Divide (1979) GPO UK Telephone Directory Production - UK Industrial Film
23:56
Building A 1960's Electromechanical Telephone Exchange For People To Use
24:29