4. Telephonic communications
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Bus system for transmitting optical signals

Telephonic communications – Terminal – Housing or housing component
Reexamination Certificate

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Business method for hybrid wireline wireless network service

Telephonic communications – Special services – Service profile
Reexamination Certificate

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Busy line display method

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Reexamination Certificate

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Busy/no-answer call completion equipment

Telephonic communications – Special services – Call diversion
Patent

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Busy/no-answer call completion equipment

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Button telephone equipment for display of calling public line nu

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Patent

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Button telephone system which displays line status information

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

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Bypass for telephone switching system

Telephonic communications – Centralized switching system – Call distribution to operator
Patent

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Bypass for telephone system splitter

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Reexamination Certificate

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