4. Measuring and testing
  5. Volume or rate of flow
  6. By measuring vibrations or acoustic energy

RD Instruments, Inc.

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Acoustic doppler channel flow measurement system

Communications – electrical: acoustic wave systems and devices – Echo systems – Speed determination
Reexamination Certificate

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System and method for flow measurement in a pipe

Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Reexamination Certificate

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System and method for measuring wave directional spectrum...

Communications – electrical: acoustic wave systems and devices – Echo systems – Speed determination
Reexamination Certificate

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