4. Communications, electrical: acoustic wave systems and devices
  5. Wellbore telemetering
  6. Through well fluids
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Borehole data transmission apparatus

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Borehole liquid acoustic wave transducer

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Borehole logging apparatus for deep well drilling

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Reexamination Certificate

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Borehole measurement while drilling systems and methods

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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