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Lens blanks, ophthalmic, glass
Lens blanks, optical glass
Prism blanks, glass
Filter glass, optical
Lens blanks, optical glass, for binoculars, magnifiers and projectors
Blanks, glass, for photographic lenses
Optical lens and prism blanks, windows, cells, fused quartz or silica
Eyeglass and contact lenses and accessories
Eyeglass lenses
