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Manifold for a horn loudspeaker and method

Acoustics – Sound-modifying means – Intensifying horn
Reexamination Certificate

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Megaphone

Acoustics – Sound-modifying means – Intensifying horn
Patent

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Megaphone apparatus

Acoustics – Sound-modifying means – Intensifying horn
Patent

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Multi purpose headgear

Acoustics – Sound-modifying means – Intensifying horn
Reexamination Certificate

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Multi-purpose headgear

Acoustics – Sound-modifying means – Intensifying horn
Reexamination Certificate

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Multiple sound transducer system utilizing an acoustic filter to

Acoustics – Sound-modifying means – Intensifying horn
Patent

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