About: http://webisa.webdatacommons.org/42909568

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	A stopper washer 52, 1 of graphite or other suitable material, is carried at the lower end of the stopper plunger within the cavity 32 and adapted to seat against the inner opening of the ingate 24.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com