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Bicycle power-assisted device, has two pallets equipped at side surface of chassis, and pallets cooperated with inner teeth of ratchet wheel, and jacking block cooperated with outer teeth of ratchet wheel. 专利
申请日期: 2008-01-01, 公开日期: 2008-07-23
作者:  CHU J YU Y ZHAO X FENG L XIN W
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