4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated

Kris W. Kimbrough

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Entry of alphabetical characters into a telephone system using a

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
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Telephone keypad matrix

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Profile ID: LFUS-PAI-P-1130282

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