4. Electrical audio signal processing systems and devices
  5. Hearing aids, electrical
  6. Directional

Robert B. Schulein

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Audio and data communications system

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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Directional microphone array system

Electrical audio signal processing systems and devices – Directive circuits for microphones
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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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-1353226

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