| http://www.w3.org/ns/prov#value | - boron carbide (CBN), diamond, or other materials with a hardness greater than that of alumina as the abrasive...http://www.google.es/patents/US6425805?utm_source=gb-gplus-sharePatente US6425805 - Superhard material article of manufacture B???squeda avanzada de patentes N???mero de publicaci???nUS6425805 B1Tipo de publicaci???nConcesi???n N???mero de solicitudUS 09/559,745 Fecha de publicaci???n30
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