4. Amplifiers
  5. With semiconductor amplifying device
  6. Including frequency-responsive means in the signal...

Postech Academy Industry Foundation

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High-efficiency power amplification apparatus using...

Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Reexamination Certificate

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Ultrasonic transducer for ranging measurement with high...

Communications – electrical: acoustic wave systems and devices – Echo systems – Parametric sonar
Reexamination Certificate

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