| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a labyrinthine toy by using two pipes joined together slidably. SOLUTION: Grooves, which are intended to be a labyrinth, are provided in one of mating surfaces of the two pipes joined together slidably, and a protrusion is provided in the other mating surface of the pipe on an opposite side and made to pass through the grooves on the opposite side for play.
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