4. Music
  5. Accessories
  6. Tuning devices

Paul R. Armstrong

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Acoustical detection and tracking system

Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent

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Non-destructive method and apparatus for detection of fruit and

Optics: measuring and testing – By shade or color – With color transmitting filter
Patent

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System and method for tuning an instrument to a meantone tempera

Music – Accessories – Tuning devices
Patent

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Profile ID: LFUS-PAI-P-39642

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