About: http://webisa.webdatacommons.org/387269503

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	Further, the membrane for the S-shaped valve may be formed of any suitable flexible material, including Mylar.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com