About: http://webisa.webdatacommons.org/360340194

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	In the preferred embodiment, the inner tube 18 is a shell or profile of steel or other hard refractory material such as for example titanium or a ceramic or tungsten carbide.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca