4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Network interface device

Samuel T. Alexander

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Apparatus and method for echo characterization of a communicatio

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Echo canceller using parametric methods

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Gravimeter

Measuring and testing – Gravitational determination
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