About: http://webisa.webdatacommons.org/169201972

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	iron, although other materials such as aluminum or the use of a separate valve plate would also be acceptable.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com