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Behold the Trommelwähler!

https://www.youtube.com/watch?v=np5tJXFKhyU

From the Herbert H. Warrick, Jr. Museum of Communications, who note: "I've seen this style of dial illustrated in early human-factors study reports. I didn't know they actually made them! (more…)

FUENTE:

http://boingboing.net/2017/03/20/fg-sk-54-s-3005-b.html