4. Communications: electrical
  5. Wellbore telemetering or control
  6. Selective control of subsurface equipment
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Data transmission system

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

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Downhole power generation and communications apparatus and...

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

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Drill string rotation encoding

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
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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Dual spectra well logging system

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

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