A ten billion Barrel with two marbles replaced by a doublesized piece.

• Inventor: Karst Nauta
• Mechanism: Intersecting rings and plungers (Ten Billion Barrel)
• Patents: Unknown
• Producer: Custom
• Year: 1996
• Original Price: $0.00 USD
• Current Price: No Data

This could be viewed as bandaged Ten billion barrel.
Marcel Gillen conceived the idea. Karst Nauta built it and presented it as exchange puzzle during IPP 16 in Luxemburg 1996.

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