About: http://webisa.webdatacommons.org/455229429

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	It has been found that the defects present in most prior well controllers are such that the controllers themselves are of limited economic and practical value.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com