About: http://webisa.webdatacommons.org/442608769

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	A concave dome portion 82 of the ceramic insert 70 (which is equivalent to external portion 30 shown in FIGS. 2 and 2A) is made of a densely packed ceramic or ceramic forming material such as alumina, zirconia and silicon nitride.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com