A milling apparatus containing a radially symmetrical sleeve having an axial passageway with an upstream inlet and a downstream outlet or vice versa, a radially symmetrical rotor located within the sleeve, one of the rotor and sleeve being rotatable relative to the other, the diameter of the rotor being...http://www.google.fr/patents/US7857247?utm_source=gb-gplus-shareBrevet US7857247 - Milling system
