4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Public address system

Edwin E. Hedeen

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Hand held, self contained, personal voice amplifier

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Public address system
Patent

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Portable voice amplifier

Electrical audio signal processing systems and devices – Megaphones
Patent

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Profile ID: LFUS-PAI-P-1660282

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