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

ACS Communications

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Hinged acoustical voice tube

Acoustics – Speaking tubes – Tubes
Patent

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Telephone headset

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

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Time dependent, variable amplitude threshold output circuit for

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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