| 摘要 |
Left and right rails are supported on a frame and movable up and down with respect thereto. Left and right skates are supported on respective rails and movable back and forth with respect thereto. As a result, each skate is movable through a variety of paths within a respective vertical plane. Each rail is a leaf spring and provides its own, inherent reactionary force in response to upward and downward movement thereof.
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