4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Element or attachment

Clayton C. Williamson

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Full range loudspeaker

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate

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Speaker transducer

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Design Patent

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Speaker transducer

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Design Patent

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Surround having a sinusoidal face

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Design Patent

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Tangential stress reduction system in a loudspeaker suspension

Acoustics – Diaphragm – Mounting or suspension means
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2435337

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