4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Housed microphone

Wolfgang Niehoff

Inventor

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Device for bi-directional transmission of audio and/or video...

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate

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Information system

Communications: electrical – Continuously variable indicating – With meter reading
Reexamination Certificate

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Microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Housed microphone
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2418229

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