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521 SEPARATING, CRUSHING, MILLING, CHOPPING, GRINDING, AND RELATED OCCUPATIONS. This group includes occupations concerned with setting apart materials in a mixture by filtering, sifting, straining, squeezing, precipitation, centrifugal pressure, or agitation, and breaking materials and reducing them to smaller size by compression, chipping, and smashing.Recent Tender For Grinding Rings And Balls From Coal. Recent tender for grinding rings and balls from coal mills of uttar pradesh. AS PER PURCHASERS TENDER SPECIFICATION REQUIRED AT AFFF, BARC, RINGS AND HOLLOW GRINDING BALLS FOR 85E10 COAL MILLS AS details Directorate of Purchase and Stores Tender Documents Manage tender process as follows for all tenders of Grinding Mills.