Why isn't the 1XB completing calls?
23:18
How many different ways can we cause trouble in the 5XB?
23:20
How does a No. 1 Crossbar Marker work?
26:27
The 5XB Trouble Recorder
30:32
All About Telephone Power Plants
37:37
Standing Inside a Broadcast Transmitter While it's ON!
33:17
[Panel] How does the line finder work?
28:44
Transforming A Stainless Steel Bolt Into A Fully Functioning Miniature Lathe Chuck
27:08