| 摘要 |
A movable table positioned to a predetermined position with respect to a base through manual movement, fixed to the base after the positioning. A lift mechanism that releases a top plate from a fixed state and lifts the top plate from the base against an attraction force of a magnet, or against the attraction force and the gravity of the magnet, and a mechanism that lowers the top plate from a predetermined lifted position with either or both the attraction force or the gravity of the magnet, and fixes the top plate to the base with an action of the attraction force of the magnet.
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