4. Telephonic communications
  5. Centralized switching system
  6. Call distribution to operator

SBC Services Inc.

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Device and method for imparting movement to a selected line

Electricity: conductors and insulators – Boxes and housings
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Method and system for presenting billing information...

Telephonic communications – With usage measurement – Call charge metering or monitoring
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Method and system for presenting billing information...

Telephonic communications – With usage measurement – Call charge metering or monitoring
Reexamination Certificate

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Method for NPA split processing on a service control point

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
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Method of billing in an abbreviated dialing service

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