About: http://webisa.webdatacommons.org/196545123

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	One of the holes is a compensating port located behind the seal of the associated piston.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com