| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a step cushion allowing spot marathon in a comparatively silent manner even in a narrow place in a house by putting a foamed urethane in the cushion. Ž<P>SOLUTION: A foamed urethane is put in the cushion so that spot marathon can be performed in the comparatively silent manner even in the narrow place in the house. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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