4. Communications, electrical: acoustic wave systems and devices
  5. Wellbore telemetering
  6. Through well fluids
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High impact communication and control system

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

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High impact communication and control system

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

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Hydraulic impulse generator and frequency sweep mechanism...

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

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Hydraulic oscillator for use in a transmitter valve

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

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Hydraulic oscillator for use in a transmitter valve

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

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Hydraulically balanced reciprocating pulser valve for mud...

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

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Hydrophone for use in a downhole tool

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

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Hydrophone for use in a downhole tool

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

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