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Group the wooden balls on both oval tracks.
It is not obvious from the picture, but some balls are joined together in pairs. In fact, the balles in a loop alternate between a single loose ball and a joined pair. This alternating order cannot be changed by mixing the puzzle.
Size: 130 x 130 x 25 mm
The year was taken from the corresponding entry in the Lilly Library.
Images 4 and 5 proove that there were at least two different packagings.
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Thank you to the following people for their assistance in helping collect the information on this page: Geert Hellings.
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