About: http://webisa.webdatacommons.org/308450309

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	Any type of check valve can be employed in the practice of the present invention, including ball check valves, umbrella check valves, and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com