4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Speaker or housing therefor

Howard Krausse

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Electroacoustic network

Electrical audio signal processing systems and devices – Including phase control
Patent

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Loud speaker

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor
Patent

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Loudspeaker

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor
Patent

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Single and double symmetric loudspeaker driver configurations

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent

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Surround sound loudspeaker system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1277069

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