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Shifting to top gear with specialized designs for coal grinding .Jun 16, 2015 . However, the optimal coal mill gear box is not simply a scaled version of the larger vertical .. MAAG WPU two-stage gear unit for vertical mills.two stage gearboand for a coal mill grinder,Two Stage Grinding Circuit - 911 MetallurgistApr 19, 2016 . The comparison between single stage and double stage grinding has received . both single and two-stage grinding in typical mill flowsheets.John Frank