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

John R. Zabel

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Active digit cancelling parallel dialer

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

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Low power dialer

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Reexamination Certificate

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Method and apparatus for defeating predictive telemarketing...

Telephonic communications – Call or terminal access alarm or control – At substation
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1962645

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