4. Telephonic communications
  5. Centralized switching system
  6. Structure of equipment

J. Michael Jarvis

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Digital telephone station line controller

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent

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Distribution frame board

Telephonic communications – Centralized switching system – Structure of equipment
Patent

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Station line switching control system

Multiplex communications – Wide area network – Packet switching
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Profile ID: LFUS-PAI-P-206461

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