<http://webisa.webdatacommons.org/109404590>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/109404590>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/prov/44787938>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/109404590> .
<http://webisa.webdatacommons.org/109404590>	<http://www.w3.org/ns/prov#value>	"In another approach, the surfaces are of an identical, but very hard, material such as diamond or jeweled bearings." .