About: http://webisa.webdatacommons.org/421842843

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	n valve in that the valve moves between an open position and a closed position depending upon whether the patient is inhaling or exhaling.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com