4. Communications, electrical: acoustic wave systems and devices
  5. Signal transducers
  6. Underwater type

Charles W. Allen

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Back pressure flapper valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Phased beam transducer

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent

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Sonar navigation system

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

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Profile ID: LFUS-PAI-P-817224

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