4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. With blocking of normal usage

James P. Hogan

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Channel interface unit

Telephonic communications – Subscriber line or transmission line interface
Patent

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Channel interface unit

Telephonic communications – Repeater – With signal conversion
Patent

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Channel interface unit

Telephonic communications – Repeater – With signal conversion
Patent

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Loop status verification system

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

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Loop status verification system

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

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Profile ID: LFUS-PAI-P-438956

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