| 摘要 |
A core, a flexible pad covering the core and a synthetic resinous skin covering the pad are layered each other. A thread is arranged on a surface side of the skin and has portions inserted in grooves of the pad through through-holes of the skin. Stoppers engage a rear side of the skin for stopping the portions of the thread from coming off from the skin. A sewing line is formed along the though-holes.
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