About: http://webisa.webdatacommons.org/20170184

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	DESCRIPTION OF THE PRIOR ART One prior art system for providing a source of electrical energy in the downhole well tool is a simple electrical dry cell or battery.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr