4. Telephonic communications
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2-wire/3-wire converting apparatus

Telephonic communications – Subscriber line or transmission line interface
Patent

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20 Hz ring generator using high frequency PWM control

Telephonic communications – Call signal generating
Patent

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2nd level power fault testing apparatus for testing...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Reexamination Certificate

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2nd level power fault testing apparatus for testing...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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