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kwhitefoot
on April 2, 2017
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Raspberry Turk
I'm fairly sure I saw a machine that did it with magnets many years ago. But it's such a vague memory that I wasn't sure I didn't imagine it.
Found a video of one:
https://www.youtube.com/watch?v=BobOCMj1Qhs
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Found a video of one: https://www.youtube.com/watch?v=BobOCMj1Qhs