1,About Toper Zhengzhou Toper is the leading supplier of industrial equipment in china, and also the professional exporter and service provider of mining machinery. We focus on complete service for design to after sales and spare parts fast supply on such aspects : ore crush and grind equipment, large and medium scale mining production line, cement production line of less than 5000 t/d, ball mill for coal, full set of production equipments for oxide pellet, full set of production line for ...