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为了选煤、磷酸盐和其它矿物申请装置为专利,装置是由二个普通的圆柱形的槽子组成,一个排在另一个的下面,自身刚性连接。上面
In order to apply for coal preparation, the patent application for phosphate and other minerals is patented. The device is made up of two ordinary cylindrical troughs, one below the other and rigidly connected to itself. Above