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

William A. Weeks

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Audio limiting circuit

Electrical audio signal processing systems and devices – Including frequency control
Reexamination Certificate

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Audio limiting circuit

Electrical audio signal processing systems and devices – Including frequency control
Reexamination Certificate

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Auditory user interface

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

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Profile ID: LFUS-PAI-P-2690110

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