Strowger Step-by-step Demonstration
1:40:10
The Line Finder In The Step-By-Step Telephone Switching System
22:38
My vintage Strowger Telephone Exchange Demonstrator
8:26
AT&T Archives: The Step-By-Step Switch
1:54:48
Telephone Switching Before Computers
14:27
BIG Museum Telephone Exchange Rundown - Telephone Tuesdays
13:40
How does MF signaling work? - Dial Equipment Appreciation, Part 3
22:28
”THE TELEPHONE EXCHANGE” 1982 BRITISH TELECOMMUNICATIONS DOCUMENTARY MONDIAL HOUSE XD47854
37:31