4. Electrical audio signal processing systems and devices
  5. Having microphone

Kiichi Yoshida

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Power supply circuit for use with an electrostatic transducer

Electrical transmission or interconnection systems – Miscellaneous systems – Power packs
Patent

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Vacuum tube microphone apparatus

Electrical audio signal processing systems and devices – Having microphone
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Profile ID: LFUS-PAI-P-1982580

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