4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Microphone capsule only

Norman A. Josephson

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Method and apparatus for presentation of on-line directional sou

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Patent

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Method and apparatus for presentation of on-line directional sou

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone
Patent

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Method and apparatus for providing a portable visual display

Education and demonstration – Cathode ray screen display and audio means
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