About: http://webisa.webdatacommons.org/9012081

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	Preferably, pistons 280a and 280c and pistons 280b and 280d are integrally formed of a flexible plastic material, such as the materials used to form the above-described pistons 80a-80d.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com