4. Television
  5. Two-way video and voice communication
  6. User positioning

John J. Champa

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Digital video switch for video teleconferencing

Television – Two-way video and voice communication – User positioning
Patent

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Multimedia interface for a communications network

Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1777767

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