About: http://webisa.webdatacommons.org/177584754

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	d in said passageway, to permit flow through said passageway from said pump portion to said upper portion and to prevent fluid flow in the reverse direction, said check valve including a seat removably threaded into said piston. 33.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr