4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated
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Unified method and apparatus to simplify telephone area code dia

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

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Unified method and apparatus to simplify telephone area code...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Unified method and apparatus to simplify telephone area code...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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