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

AT&T Information System Inc.

Corporate Assignee

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

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Integrated switching system and announcement circuit

Multiplex communications – Wide area network – Packet switching
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PBX integrity arrangement for maintaining the functional integri

Telephonic communications – Call or terminal access alarm or control – At switching center
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Resistive line feed circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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