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Advanced intelligent network based computer architecture for con

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Anonymous interactive telephone system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Audio interface for telecommunications test system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Back wiring board and aggregated device

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Reexamination Certificate

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Board-to-board test unit for a digital subscriber line

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Cable pair tester

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Cable pair tester

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Channel check test system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Reexamination Certificate

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Communication network cut-off detection arrangement

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Customer line tester

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Data transmission system and method having improved alarm inhibi

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Digital service unit

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Electronic controller for sprinkler systems

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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External analog loopback

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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External apparatus for monitoring a communication system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Fast and noise-insensitive load status detection

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Integrated bit error rate test function in analog channel unit o

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Line current test device

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Loop detection signal issuing circuit in subscriber circuit havi

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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Loop status verification system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
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