About: http://webisa.webdatacommons.org/322993040

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 embodiments of valve illustrated in FIGS. 1-4 can be made from the same material as the other components of the invention and do not require springs or other mechanical devices.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com