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Patents
Optics: Eye Examining, Vision Testing And Correcting Patents
Spectacles And Eyeglasses (351/41)
Ophthalmic Lenses Or Blanks (351/159) Patents
Multifocal (351/168) Patents (Class 351/FOR110)
Multifocal (351/168) Patents (Class 351/FOR110)
Foreign Patent Art Collections
Gradually varying focal power (351/169) (Class 351/FOR111)
With prismatic segment (351/170) (Class 351/FOR112)
Three or more foci (351/171) (Class 351/FOR113)
Multiple elements (351/172) (Class 351/FOR114)
There are no patents to show for this class.