4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation

Bonita F. Lewis

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Circuit device for controlling the actuated state of an electric

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telecommunication system with subscriber controlled feature modi

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

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Telephone apparatus for the hearing impaired

Telephonic communications – Terminal accessory or auxiliary equipment
Patent

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Profile ID: LFUS-PAI-P-1204557

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