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Optics: eye examining, vision testing and correcting

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
351041000 SPECTACLES AND EYEGLASSES 1313
351200000 EYE EXAMINING OR TESTING INSTRUMENT 1310

Patent applications in all subclasses Optics: eye examining, vision testing and correcting