<http://webisa.webdatacommons.org/212685136>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freepatentsonline.com> .
<http://webisa.webdatacommons.org/prov/47843939>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/212685136> .
<http://webisa.webdatacommons.org/212685136>	<http://www.w3.org/ns/prov#value>	"A ceramic material such as Alumina is presently preferred for this purpose." .
<http://webisa.webdatacommons.org/212685136>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .