A grinding mill is a tool that is designed to break a solid material into smaller pieces. There are many different types of grinding mills and many types of materials processed in them.
Small mills can be powered by hand, such as a mortar and pestle or a pepper grinder. Large grinding mills were usually powered by working animals, wind (windmill) or water (watermill) in the past. In the 2000s, most large grinding mills are powered by electricity.
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