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Underwater detecting apparatus, depth measuring apparatus...

Acoustics – Echo system – Altitude or depth detection
Reexamination Certificate

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Underwater generation of low frequency sound

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Underwater seismic source

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Underwater seismic testing

Acoustics – Geophysical or subsurface exploration – Seismic source and detector
Patent

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Underwater shear wave vibrator coupling

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Underwater sound generator

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Underwater sound mitigation system for explosive testing

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Reexamination Certificate

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Underwater voice communicator

Acoustics – Speaking tubes – Mouthpieces
Patent

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Underwater voice communicator

Acoustics – Anatomic or prosthetic relation – Dentiphone
Patent

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Unidirectional enhancer for microphones

Acoustics – Diaphragm and enclosure
Patent

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Unidirectional speaker enclosure

Acoustics – Diaphragm and enclosure – Rounded enclosure
Patent

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Unitary anti-skid vibration dampening structure

Acoustics – Sound-modifying means – Mechanical vibration attenuator
Patent

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Unitary elastic muffler assembly for a pneumatic device

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Unitary tuned port and loudspeaker frame

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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Universal heat shield

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Universal muffler assembly

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Universal muffler construction assembly

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Use for a seismic energy pulse generator for generating and shap

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Use of a material with a high internal damping for a...

Acoustics – Sound-modifying means – Mechanical vibration attenuator
Reexamination Certificate

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Use of autonomous moveable obstructions as seismic sources

Acoustics – Geophysical or subsurface exploration – Well logging
Reexamination Certificate

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