4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated
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Non volatile automatic telephone dialer circuit

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

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Non-volatile automatic telephone number dialer circuit

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

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Number keypad corral

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

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