Hardgrove, Ralph M. Stock Equipment Company, Cleveland, Ohio.
Last reviewed:January 2020
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A machine that reduces the size of particles of raw material fed into it. The size reduction may be to facilitate removal of valuable constituents from an ore or to prepare the material for industrial use, as in preparing clay for pottery making or coal for furnace firing. Coarse material is first crushed. The moderate-sized crushings may be reduced further by grinding or pulverizing.
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