See the First “Drum Machine,” the Rhythmicon from 1931, and the Modern Drum Machines That Followed Decades Later

<http://www.openculture.com/2016/03/hear-the-first-drum-machine-the-rhythmicon-from-1931.html>

"I doubt many people have ever heard of it, yet it can probably claim the title
of the first drum machine—or at least first rhythm machine—ever built."

The history of early drum machines.  Via Wolfie Rankin.

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                *** Xanni ***