4. Telephonic communications
  5. Special services
  6. Call diversion

Amtelco

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Computer data entry method and apparatus

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

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Telephone line concentrator without switching matrix

Telephonic communications – Special services – Call diversion
Patent

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Profile ID: LFUS-PAI-P-908440

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