| http://www.w3.org/ns/prov#value | - ormation resistivity measurement while drilling, utilizing physical conditions representative of the signals from a toroidal coil located adjacent the drilling bitUS3488574Nov 1, 1966Jan 6, 1970Schlumberger Technology CorpBorehole investigating methods and apparatus including the detection of a cased borehole from another nearby boreholeUS4468623Jul 30, 1981Aug 28, 1984Schlumberger Technology Corp
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