About: http://webisa.webdatacommons.org/237234673

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	U.S. Pat. Nos. 4,748,415; 4,901,023; 5,065,100 and 5,260,661 to Vail, III are directed toward measuring the resistivity of earth formation from within a borehole cased with highly conducting material such as steel.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com