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Rubik's like ring shaped puzzle. The puzzle turns the upper and lower half of the ring. The colors are seperated in four sections.
The year given here is an upper bound. This puzzle was shown in "The book of ingenious an diabolical puzzles" from 1994.
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Thank you to the following people for their assistance in helping collect the information on this page: Warren Pemberton, Ton Dennenbroek.
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