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Internal ported band pass enclosure for sound cancellation

Acoustics – Sound-modifying means – By wave interference
Patent

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Internal sidebranch resonator

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

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Internally ventilated noise suppressor for jet engine

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

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Inverted cone tuned exhaust system

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

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