| http://www.w3.org/ns/prov#value | - igating methods and apparatus including the detection of a cased borehole from another nearby boreholeUS3521154 *Jul 3, 1967Jul 21, 1970Schlumberger Technology CorpMethods and apparatus for enhancing well logging signals by the use of multiple measurements of the same formation characteristicUS3579098 *Oct 24, 1968May 18, 1971Dresser IndMethod and combination well-logging apparatus for conducting
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