| 摘要 |
PROBLEM TO BE SOLVED: To provide a jigsaw puzzle having a true three-dimensional effect. SOLUTION: This three-dimensional jigsaw puzzle has a small piece including a projecting part and a cutout part. The projecting parts and cutout parts of two adjacent small pieces are made to correspond to each other. Since the respective small pieces are tangential parts of a sphere, all of the small pieces are combined to form a sphere. COPYRIGHT: (C)2004,JPO
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