About: http://webisa.webdatacommons.org/219220642

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 restoring spring drives the shaft back into the housing, i.e. upward in FIG. 2 to complete the reciprocating stroke.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com