How does a No. 1 Crossbar Marker work?
35:12
How does a No. 1 Crossbar work? - Dial Equipment Appreciation, Part 2
14:00
A BABY TO THE STRANGE old Electromechanical "Flip Dot" Display. How Does It Work?
23:18
How many different ways can we cause trouble in the 5XB?
27:08
At the Connections Museum: the insane telephone technology that led to today's computers
22:35
Teletype Model 19 (and Model 15) Demonstration
3:58
1950s Switchboard Operations
17:59
1947 Electronics - Will It Still Work Today? Find Out!
41:36