| 摘要 |
PROBLEM TO BE SOLVED: To improve operability in a rotary seat during locking and unlocking. SOLUTION: A plurality of sliders 30 and 31 having different length in a sliding direction are laid inside of a deformation preventing part comprising an engaging part A (10) and an engaging part B (20) to be mutually engaged which are provided in a fixed plate 1 and a moving plate 2.
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