4. Communications, electrical: acoustic wave systems and devices
  5. Wellbore telemetering
  6. Through well fluids
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Fluid driven siren pressure pulse generator for MWD and flow mea

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

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Fluid erosion protection washer for rotating shaft in MWD tool

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

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Fluid means for data transmission

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

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Fluid oscillator

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

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Fluidic mud pulser

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

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