4. Geometrical instruments
  5. Indicator of direction of force traversing natural media
  6. Process

Scientific Drilling International

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Apparatus and method for electric field telemetry employing comp

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
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Apparatus and method for electric field telemetry employing...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate

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Apparatus for locking wire line instrument to drill collar

Wells – Processes – Placing or shifting well part
Patent

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Calibration correction method for magnetic survey tools

Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Patent

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Coal boundary detection using an electric-field borehole...

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Reexamination Certificate

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