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at least one of the sources or one of the detectors being located above ground
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Industry
CPC
E21B47/02224
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21B
EARTH DRILLING
E21B47/00
Survey of boreholes or wells
Current Industry
E21B47/02224
at least one of the sources or one of the detectors being located above ground
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