Section 18 OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION , MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; M USICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 Optical, photographic, cinematographic measuring, checking, precision, medical o 90 18 Instruments and appliances used in medical, surgical, dental or veterinary scien Commodity Code Description 90 18 11 90 18 12 90 18 13 90 18 14 90 18 19 90 18 20 90 18 31 90 18 32 90 18 39 90 18 41 90 18 49 90 18 50 90 18 90