4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Of data transmission

Douglas A. Hahn

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Pro-active billing and routing test set

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission
Patent

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Programmable automatic call-thru set

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

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Profile ID: LFUS-PAI-P-175083

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