4. Cryptography
  5. Cryptanalysis

Michael J. Knowd

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Circuitry for characterizing speech for tamper protected recordi

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
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Decoder for a recorder-decoder system

Cryptography – Cryptanalysis
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Retroluminometer

Optics: measuring and testing – Of light reflection
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Sound pressure level meter

Measuring and testing – Vibration – By mechanical waves
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Profile ID: LFUS-PAI-P-1216307

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