| http://www.w3.org/ns/prov#value | - gging by measuring the electric field created by a time-varying magnetic fieldUS3488574 *1 Nov 19666 Jan 1970Schlumberger Technology CorpBorehole investigating methods and apparatus including the detection of a cased borehole from another nearby boreholeUS3493850 *20 Jan 19643 Feb 1970Schlumberger Technology CorpApparatus for investigating formations surrounding a borehole including means for gene
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