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Small amounts of water dripping on the stone as it turns wet grinding, keeps the stone from over-heating.Early grinding wheels, rotated by two cranks, one on each end of its axle, date from around 1340.Circa 1480, the early medieval rotary grindstone was improved with a treadle and crank mechanism.Pedals to power the rotating lathe allow.
We are a large-scale joint-stock enterprise integrating scientific research, production and sales.Our leading products have crushing equipment, sand making equipment, mobile crusher, etc., Each type of product is with complete specifications. All products have passed ISO9001, CE and GOST international quality system certification.