4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Connection call model

Robert Bergman Levy

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Enhanced conference call service

Telephonic communications – Special services – Conferencing
Reexamination Certificate

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Method and apparatus for maintaining uninterrupted telecommunica

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

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Method and apparatus for subscriber line to telephone call...

Telephonic communications – Private or single line system – Having plural stations with selective calling
Reexamination Certificate

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Method for achieving third-number call billing

Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent

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