| 摘要 |
PURPOSE: To provide a head support adjuster that requires no attachments such as a pump, is mechanically and operationally simple and ensures cost reduction. CONSTITUTION: The head support adjuster 7 comprises a flexible jacket 71 with an internal sealed space, an elastic member 72 disposed in the sealed space, and an opening and closing mechanism 73 interposed between the interior of the flexible jacket 71 and the atmosphere.
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