Section 18 OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 OPTICAL, PHOTOGRAGHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 02 OTHER THAN SUCH ELEMENTS OF GLASS NOT OPTICALLY WORKED,. 90 02 20 FILTERS FOR PHOTOGRAPHIC OR CINEMATOGRAPHIC APPARATUS INCLUDING PROJECTORS Commodity Code Description 90 02 20 10 FILTERS FOR PHOTOGRAPHIC OR CINEMATOGRAPHIC APPARATUS INCLUDING PROJECTORS 90 02 20 90 OTHER FILTERS