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A japanese version of the wellknown Ten Billion Barrel
This version of the Ten Billion Barrel was sold in Japan in the early eighties. The correct years is so far unknown but it can't be earlier than 1985.
The puzzle works like the other editions of the ten billion barrel.
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Lawrence Cuthbert.
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