作者: Yiang-Chou Liu
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摘要: The structure of lay board according to the present invention is composed a front board, middle and rear board. Those three boards are pin-jointed by several pivots, one pad installed on each wheels at bottom such that chassis can be easily accessed or tool taken while maintaining repairing vehicle. Besides, since foldable, not only maintenance man sit it during repairing, but space for storing saved as well. thus multiple purpose appliance.