About: http://webisa.webdatacommons.org/200831352

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 apparatus according to claim 1, including in addition thereto, a plug in said tubular string below said at least one orifice to prevent said second fluid from being pumped out the lower end of said tubular string.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com