The 5XB Trouble Recorder
23:18
How many different ways can we cause trouble in the 5XB?
28:19
Malfunctioning Potted Relays: Emergency Repair in the No. 5 Crossbar
8:26
AT&T Archives: The Step-By-Step Switch
24:29
CARW: Bell's Nuclear-War Telephone Network
18:18
AXXESS L1 : Un son positivement vivant.
19:03
The Machine that Makes Your Phone Ring
23:20
How does a No. 1 Crossbar Marker work?
19:22