| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of a conventional mattress in which a load is applied to the body when lying on the back since the bulge of the buttocks disturbs to make the body parallel to the level. SOLUTION: A dent is formed in a part of the mattress so that the impeditive bulge of the buttocks can be stored therein. Thereby the load on the backbone resulting from the bulge of the buttocks when lying on the back is eliminated. COPYRIGHT: (C)2011,JPO&INPIT
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