4. Multiplex communications
  5. Wide area network
  6. Packet switching

David Systems, Inc.

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Digital timeslot and signaling bus in a digital PBX switch

Multiplex communications – Wide area network – Packet switching
Patent

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Distributed clock synchronization in a digital data switching sy

Pulse or digital communications – Spread spectrum – Direct sequence
Patent

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Interswitch line circuit

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Method and apparatus for coupling computer work stations

Multiplex communications – Wide area network – Packet switching
Patent

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