4. Electrical audio signal processing systems and devices
  5. One-way audio signal program distribution
  6. Public address system
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Process for varying speech speed and device for implementing sai

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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Processing of acoustic waveforms

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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Public address amplifier

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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Public address system

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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Public address system and method for an urban transit vehicle

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Reexamination Certificate

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