4. Electrical audio signal processing systems and devices
  5. Hearing aids, electrical
  6. Frequency transposition
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Hearing aid apparatus

Electrical audio signal processing systems and devices – Hearing aids – electrical – Frequency transposition
Reexamination Certificate

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Hearing aid with different assemblies for picking up further...

Electrical audio signal processing systems and devices – Hearing aids – electrical – Frequency transposition
Reexamination Certificate

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Hearing aid with enhanced high frequency reproduction and...

Electrical audio signal processing systems and devices – Hearing aids – electrical – Frequency transposition
Reexamination Certificate

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