4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation
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Integrated circuit amplifier and method of adaptive offset

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

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Integrated circuit for generating a melody and ring

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

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Integrated ringing circuit and a ring trip circuit for the same

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

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Intelligent multimode message alerts

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

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Interrupted tone converter

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

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Intrinsically safe telephone

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

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ISDN interface unit with separate ring generator

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

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