4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
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Process for the recognition and separation of useful and interfe

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent

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Process of acoustic emission for sonar

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent

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Processing echoes in ultrasonic liquid gauging systems

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent

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Processing technique for forward looking sonar

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Reexamination Certificate

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Proximity device

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent

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Proximity indicating equipment

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent

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Pulse echo distance measurement

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent

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Pulse generating circuit means for depth sounder alarm and trans

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent

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Pulse-echo system for mediums having varying densities

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Reexamination Certificate

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