4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated
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Variable color display telephone

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

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Voice-controlled telephone using visual display

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

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Waveform generators

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

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Wide keypad and wide keypad mounting structure for...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Wireless telephone remote control system

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

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