4. Communications: electrical
  5. Wellbore telemetering or control
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Drill string telemetry

Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Reexamination Certificate

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Drill string telemetry system

Communications: electrical – Wellbore telemetering or control – Pulse or digital signal transmission
Reexamination Certificate

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Drill string telemetry system and method

Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Reexamination Certificate

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Drilling assembly with reduced stick-slip tendency

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

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Drilling system with downhole apparatus for determining paramete

Communications: electrical – Wellbore telemetering or control – Pulse or digital signal transmission
Patent

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Dual spectra well logging system

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

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Duct mapping device using sonde

Communications: electrical – Wellbore telemetering or control – With position or depth recording
Reexamination Certificate

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Dynamometric measuring assembly for a drill pipe equipped with m

Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Patent

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