| 摘要 |
A toy includes an envelope having inside a rigid tubular member connected to the inner side of its wall and rod with a helical groove held by the tubular member in an axially movable position. The rod is passed through an opening of a transverse plate fixed to the tubular member and the helical groove is engaged with cam edges projected into the opening, thereby the rod will move upward and downward simultaneously with a rotating movement.
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