4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Plural or compound reproducers

Andrew J. Haapapuro

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Acoustic resistor for hearing improvement and audiometric...

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Reexamination Certificate

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Acoustic resistor for hearing improvement and audiometric...

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making named article
Reexamination Certificate

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Directional microphone assembly

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

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Directional microphone assembly

Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate

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Directional microphone assembly

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

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Profile ID: LFUS-PAI-P-2249021

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