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How was this clock made? Answered

Hi everyone, I found this clock , the D/A clock by Alvin Aronson, and I am wondering if anyone knows how to make this clock or if anyone knows how he made it?

http://www.youtube.com/watch?v=C9tW6FIX8oQ&NR=1

cheers

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ehfo (author)2011-10-28
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Kiteman (author)2011-10-27

It looks like a set of small servos lifting and lowering the segments in the desired sequence.

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