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Hongrun Machinery designs and produces the customized products including cusher, crushing plant, oil mill, trencher, corn harvester and pulverizer. Call Us 008613592505674 Email salescnhrmachinery.com A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many processes.There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand or by animals (e.g., via a hand crank), working animal (e.g., horse mill), wind or water ().