About: http://webisa.webdatacommons.org/304423571

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 invention of claim 12 wherein said circulating means comprises a pair of piston and cylinder assemblies, one for injecting the liquid, and other for withdrawing the liquid, said assemblies being adapted for simultaneous operation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au