4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Plural or compound reproducers

Yu Guan

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Apparatus and methods for reducing thin film color variation...

Optics: measuring and testing – Inspection of flaws or impurities – Surface condition
Reexamination Certificate

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Headphones

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent

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Methods for forming a calibration standard and calibration...

Optics: measuring and testing – Standard – Surface standard
Reexamination Certificate

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Monitoring substrate processing using reflected radiation

Optics: measuring and testing – By polarized light examination – Of surface reflection
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1797716

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