AT&T Telessentials Switching TC1604
51:43
AT&T Telessentials Communication networks TC1605
12:43
5ESS Switch - Ready For Tomorrow
23:20
How does a No. 1 Crossbar Marker work?
10:44
A Call To PEnnsylvania 6-5000 Through The Step-by-Step Telephone Switching System
25:31
AT&T Bell Labs 1 ESS (Electornic Switching System) Manufacturing Processes (1965)
11:42
5ESS Switch - Circuit Pack Replacement Procedure
14:39
"Long Distance" A short documentary on how long distance calls work - Circa 1941
1:03:43