About: http://webisa.webdatacommons.org/110635143

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The abrasive grains may be of such substances as aluminum oxide, silicon oxide, silicon carbide, tungsten carbide and the like that are harder and thus abrasive to the substance being cut.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com