About: http://webisa.webdatacommons.org/130901446

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	Preferably, these collars or toroids are spaced at intervals, such as 100-150 feet, with approximately 120 feet preferred in straight wells, and closer intervals preferred in crooked or deviated wells.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com