4. Telephonic communications
  5. Terminal accessory or auxiliary equipment
  6. With circuit connection to terminal

Leo Larsen

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Audio frequency signal compressing system

Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent

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Headset

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Headset amplifier

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

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Headset interface

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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Multipurpose headset amplifier

Telephonic communications – Terminal accessory or auxiliary equipment – With circuit connection to terminal
Patent

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Profile ID: LFUS-PAI-P-1160710

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