Optical elements; lenses n.e.c. in heading no. 9001, prisms, mirrors and other optical elements, unmounted, of any material (excluding elements of glass not optically worked)

900190 Other:

9001904000 Lenses

9001905000 Prisms

9001906000 Mirrors

9001908000 Halftone screens designed for use in engraving or photographic processes

9001909000 Other

9001900000 Optical elements; lenses n.e.c. in heading no. 9001, prisms, mirrors and other optical elements, unmounted, of any material (excluding elements of glass not optically worked)

9001900090

90019000 Other

90019000 Other

9001900010 For use in civil aircraft

9001900090 Other