4. Telephonic communications
  5. Call signal generating
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Active decoupling and power management circuit for...

Telephonic communications – Call signal generating
Reexamination Certificate

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Apparatus for sending a ringing signal and data with reduced...

Telephonic communications – Call signal generating
Reexamination Certificate

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Automatic volume control for a telephone ringer

Telephonic communications – Call signal generating
Reexamination Certificate

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