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 90 OTH.LENSES, PRISMS, MIRRORS & OTH. OPTICAL ELEMENTS, OF ANY MAT., MOUNTED 90 02 90 90 OTH.LENSES, PRISMS, MIRRORS & OTH. OPTICAL ELEMENTS, OF ANY MAT., MOUNTED Commodity Code Description 90 02 90 90 000 OTH.LENSES, PRISMS, MIRRORS & OTH. OPTICAL ELEMENTS, OF ANY MAT., MOUNTED