4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Radio receiver, tuner or amplifier, or housing therefor

Jerrell J. Duckworth

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Combined high sensitivity electronic audio receiver and amplifie

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Radio receiver – tuner or amplifier – or housing therefor
Patent

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Combined transmitter and receiver for a failure detector unit

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof
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Profile ID: LFUS-PAI-P-449629

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