4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
  6. Distance or direction finding

Richard Ove Nielsen

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Acoustic wide area air surveillance system

Communications – electrical: acoustic wave systems and devices – Receiver circuitry – Responsive to intruder energy
Reexamination Certificate

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Interferometer with a single projector array and a single...

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

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Profile ID: LFUS-PAI-P-2109263

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