… elements of glass (other than those of heading 70.15), not optically worked. …
Explanatory notes
… elements of glass (other than those of heading 70.15), not optically worked. This heading covers the following … are usually convex, hemispherical or flat with grooves normally running parallel, have the property of reflecting … are unmounted or mounted - see corresponding Explanatory Notes). Simple grinding of the edges of discs or lenses, …