4. Communications: electrical
  5. Wellbore telemetering or control
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Oil well casting electrical power pick-off points

Communications: electrical – Wellbore telemetering or control – Including specified power transmission feature or source
Reexamination Certificate

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Oil well monitoring and control system communication network

Communications: electrical – Wellbore telemetering or control – Repeater in subsurface link
Reexamination Certificate

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Oil well servicing system

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

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Optical communication system for drill hole logging

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

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Oscillating shear valve for mud pulse telemetry and...

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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