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Brewster Donald B, Emery Jr Philip H, Hatcher Robert C, Lin Cheng S: Method and apparatus for controlling pulp refiners. Westvaco Corporation, March 9, 1971: US3568939 (6 worldwide citation)

A control system, receiving inputs from a group of grinders or refiners, generates a signal representative of overall grinding or refining action. Operating from this signal, the control system controls at least one of the grinders or refiners in the group such that the cumulative qualitative output ...