Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01V
GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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3/00
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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G01V3/18
specially adapted for well-logging
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G01V3/20
operating with propagation of electric current
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