4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation
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Method of generating ring tones using melody and...

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

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Method to alert a phone operator by magnetic means of an...

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

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Motor for generating vibrational signal

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

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Multi-line programmable telephone call annunciator

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

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Multisensing circuitry for class signals and stutter dial...

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