4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Switching or supervision feature

Barry W. Barge

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System and method for interface between a subscriber modem...

Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate

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Telephone switch call control unit

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Profile ID: LFUS-PAI-P-1774554

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