About: http://webisa.webdatacommons.org/137679538

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	The valve sheet may be in the form of a seating surface attached to a frame or other support structure.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com