Crossbar telephone exchange demo
8:26
AT&T Archives: The Step-By-Step Switch
17:40
Plugging a Vintage Telephone Exchange Into The Internet So People Can Use It
4:57
09. The final process of generator power assembly
11:06
DMS-10: The first phone call!
7:50
The Traveling Telephone Switching Machine - AT&T Archives
14:11
Electromechanical memory - Impulse regenerator nr 1
10:28
Pre-2000 Strowger selector demonstrator
11:34