4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
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Omnidirectional distance measurement system

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

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Optical axis adjusting device for vehicle headlamp

Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Reexamination Certificate

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Optical correlator and method of using same

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

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Optical pickup device

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

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Orientation aid for the blind and the visually disabled

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

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Oscillator proximity switch

Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent

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Own doppler nullifier for sonar system

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

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