How does a No. 1 Crossbar work? - Dial Equipment Appreciation, Part 2
13:40
How does MF signaling work? - Dial Equipment Appreciation, Part 3
31:12
Full Mechanical: The Panel Telephone Switch
23:20
How does a No. 1 Crossbar Marker work?
26:27
The 5XB Trouble Recorder
30:17
"TOOLS OF TELEPHONY" 1956 WESTERN ELECTRIC TELEPHONE SYSTEM PROMO FILM BELL SYSTEM 98694
24:51
Bits, Bytes, and Bauds, Telecommunications for TOPS.
23:18
How many different ways can we cause trouble in the 5XB?
19:03