4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Of hybrid or echo suppressor or canceller
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Determining echo return loss in echo cancelling arrangements

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller
Patent

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Device for measuring echo return loss in a two-two wire line sys

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller
Patent

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Digital telephony card for use in an operator system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller
Patent

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Double-talk detecting apparatus, echo canceller using the...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller
Reexamination Certificate

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