4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring
  6. Indicating, testing or measuring a condition of the formation

Martin Folberth

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Electrical imaging in conductive and non-conductive mud

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Indicating – testing or measuring a condition of the formation
Reexamination Certificate

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Error correction and calibration of a deep reading...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
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Method and apparatus for improved current focusing in...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
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Profile ID: LFUS-PAI-P-2873280

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