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System of elements for the diffusion of sound in rooms...

Acoustics – Sound-modifying means – Intensifying horn
Reexamination Certificate

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Two-piece megaphone with ornamental member

Acoustics – Sound-modifying means – Intensifying horn
Patent

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Two-section exponential acoustical horn

Acoustics – Sound-modifying means – Intensifying horn
Patent

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Wave shaping sound chamber

Acoustics – Sound-modifying means – Intensifying horn
Reexamination Certificate

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Wide frequency range horn with modular method for reducing...

Acoustics – Sound-modifying means – Intensifying horn
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