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Narrowband beamformer using nonlinear oscillators

Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With beam steering – scanning – or focussing
Reexamination Certificate

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Narrowband phase difference measurement technique for sonar...

Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Reexamination Certificate

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Natator in water tank, controlling apparatus and position...

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

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Navigation system and method using directional sensor

Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With beam steering – scanning – or focussing
Reexamination Certificate

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Navigational device for a scuba diver

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

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Navigational device for an underwater diver

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

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Noise suppression system

Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Reexamination Certificate

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Noise suppression system

Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Reexamination Certificate

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