4. Telephonic communications
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Customizing called number identification

Telephonic communications – Special services
Reexamination Certificate

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Customizing prepaid service

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

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Customizing prepaid service

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

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Cutover method and device for telephone lines

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Reexamination Certificate

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Cycle-modulating type of dual-tone multifrequency generator

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Cyclic video region transmission for videoconferencing systems

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent

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