About: http://webisa.webdatacommons.org/422911086

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 bladder may be made of rubber or suitable flexible plastic materials, such as polyethylene.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com