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

Plantronics Inc.

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Accessory interface bus for telephone headset adapter

Multiplex communications – Channel assignment techniques – Details of circuit or interface for connecting user to the...
Reexamination Certificate

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Acoustic signal level limiter

Electrical audio signal processing systems and devices – Noise or distortion suppression – Peak limiting or pulsive noise compensation
Reexamination Certificate

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Adapter for communications headset

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

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Adaptive mute

Telephonic communications – Terminal – Having muting
Reexamination Certificate

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Adaptive transmit amplifier

Telephonic communications – Substation or terminal circuitry
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