The 5XB Trouble Recorder
23:18
How many different ways can we cause trouble in the 5XB?
19:03
The Machine that Makes Your Phone Ring
16:34
Booting up the 3ESS
12:34
How does telephone ringing work?
30:17
"TOOLS OF TELEPHONY" 1956 WESTERN ELECTRIC TELEPHONE SYSTEM PROMO FILM BELL SYSTEM 98694
31:56
A Restoration Adventure - [ GE Radio Receiver Restoration Series ]
41:36
Why isn't the 1XB completing calls?
28:19