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

David W. Petr

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Adaptive differential PCM coding

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Digital code converter

Communications: electrical – Audible indication – Percussion-type sound producer
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Multimode data communication system

Multiplex communications – Wide area network – Packet switching
Patent

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Profile ID: LFUS-PAI-P-621079

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