4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring

Lise Hvatum

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Bidirectional drill string telemetry for measuring and...

Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate

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Method and apparatus for locating faults in wired drill pipe

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

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