4. Communications: electrical
  5. Wellbore telemetering or control
  6. Using a specific transmission medium

John Freer

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Data communication and power supply system for downhole...

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

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Signalling method and apparatus

Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2323930

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