4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Tandem switching center
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Method and apparatus for network communication

Telephonic communications – Plural exchange network or interconnection – Tandem switching center
Reexamination Certificate

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Method and system for combining a conversion between...

Telephonic communications – Plural exchange network or interconnection – Tandem switching center
Reexamination Certificate

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