Reduction structure including a revolving rotor and stationary structure. The revolving rotor is notched to provide a series of cutter sockets that individually receive cutters, preferably hardened steel cutters. The cutters are arranged in their sockets such that a majority of the length thereof is...http://www.google.es/patents/US4176800?utm_source=gb-gplus-sharePatente US4176800 - Materials reduction structure
