A gristmill grinds grain into flour. The name refers to the grinding equipment as well as the building. Gristmills, powered by water wheels, have been around for many centuries, some as early as 19 BC.A water mill usually had natural stone as the millstone while the modern flour milling uses Emery stones , steel rollers , pulverized. The daily output from a water mill was a few 100 kilograms , while a modern day flour mill can produce 100 times more.
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