4. Acoustics
  5. Sound-modifying means
  6. Intensifying horn
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Cinema sound system for unperforated screens

Acoustics – Sound-modifying means – Intensifying horn
Patent

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Collapsible and portable megaphone

Acoustics – Sound-modifying means – Intensifying horn
Patent

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Constant directivity acoustic horn

Acoustics – Sound-modifying means – Intensifying horn
Reexamination Certificate

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Constant directivity loudspeaker horn

Acoustics – Sound-modifying means – Intensifying horn
Patent

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