21:46

The Weird Story Of Electromechanical Memory - 40 bits of the stuff!

11:16

Ericsson AGF telephone exchange 500 line selector demo

29:28

m1ke - SharkRF - Unbox & Setup - Test

10:28

Pre-2000 Strowger selector demonstrator

12:34

How does telephone ringing work?

14:57

Corded telephone switchboard demo

11:33

Wheatstone Telegraph Demonstration

25:31

AT&T Bell Labs 1 ESS (Electornic Switching System) Manufacturing Processes (1965)