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INSIDE those OLD pinball machines
(www.youtube.com)
This is a most excellent place for technology news and articles.
"CuriousMarc" on YouTube has a couple videos where he takes apart and restores an electromechanical navigation computer from an old soviet Soyuz capsule. It could show you exactly where in your orbit you were and calculate rendezvous and reentry burns, all with just a shitload of gears and things. It was incredible.