Boingboing recently featured this beautiful Trommelwähler (try saying that five times fast!) vintage telephone. The phone belongs to the Herbert H. Warrick, Jr. Museum of Communications in Seattle, who tweeted out a video of the phone.
According to the translated German Wikipedia page, Trommelwählers have:
a cylinder that is rotatable about a horizontal axis instead of a dial . The drum has the ten digits corresponding to ten indentations; The user puts a finger into a recess and thereby rotates the cylinder downwards until the stop is reached. After releasing, the cylinder ran back again.
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