4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Connection call model
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PBX system for interworking digital telephone with personal...

Telephonic communications – Plural exchange network or interconnection – Connection call model
Reexamination Certificate

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Providing the most cost-effective long-distance telephone servic

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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