4. Electrical audio signal processing systems and devices
  5. Including frequency control
  6. Having automatic equalizer circuit

Hirokazu Negishi

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Audio signal transmission system

Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent

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Electrophotographic copying apparatus utilizing liquid developer

Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
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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Loudspeaker enclosure

Acoustics – Diaphragm and enclosure – Rounded enclosure
Patent

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Operator mental condition detector

Boots – shoes – and leggings
Patent

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Profile ID: LFUS-PAI-P-357706

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