4. Electrical audio signal processing systems and devices
  5. Directive circuits for microphones

David J. Rikkers, Esq.

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Methods and apparatus for source location estimation from...

Electrical audio signal processing systems and devices – Directive circuits for microphones
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Minimally invasive surgical apparatus

Surgery – Specula – Retractor
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Silicon-on-insulator channel architecture for automatic test...

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
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