About: http://webisa.webdatacommons.org/59920517

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 field of this invention is jars for downhole use in operations such as drilling and fishing and more particularly to fluid operated jars that function bi-directionally.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com