4. Acoustics
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Duct for reducing shock related noise

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate

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Duct liner acoustic splice

Acoustics – Sound-modifying means – Sound absorbing fence or screen
Reexamination Certificate

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Duct silencer

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

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Duct wall structure

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate

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Ducted port reflex enclosure

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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Ductless acoustical noise attenuator

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

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Durable porous article of manufacture and a process to...

Acoustics – Sound-modifying means – Sound absorbing panels
Reexamination Certificate

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Dust protection cap for conical loudspeaker

Acoustics – Diaphragm – Critically defined material or coating
Patent

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Dynamic loudspeaker

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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