4. Telephonic communications
  5. Telephone line or system combined with diverse electrical...
  6. Having transmission of a digital message signal over a...

Rickens T. Szeto

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Station set directory assistance arrangement

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

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Station to station message arrangement

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent

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Profile ID: LFUS-PAI-P-108453

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