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

Douglas L. Manchester

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Data transmission multiplexer control panel

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

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Passive contactless smartcard security system

Registers – Systems controlled by data bearing records – Credit or identification card systems
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1363608

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