No long repair videos here. Just popular demos of vintage stuff that finally works.
The first digital communication equipment, all electro-mechanical, in sturdy military guise. You'll be amazed at what this 1930's era hardware could do. No wonder it stayed in use until the 1980's.
Friden STW10 Mechanical Calculator Demos
The 1957 mechanical calculator that helped calculating orbits of the Mercury missions shows its mettle.