About: http://webisa.webdatacommons.org/38657191

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 system of claim 6 wherein the valve member comprises a ball, and including means for retaining the ball in the proximity of the seat.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com