4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated
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Handheld electronic device having improved phone call log,...

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

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Hands free phone set with hand held remote control for controlli

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

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Hold and dial accessory for telephone instrument

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

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Hybrid alphanumeric telephone directory

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

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