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 33 Parts and accessories (not specified or included elsewhere in this Chapter) for 90 33 00 90 33 00 00 Commodity Code Description 90 33 00 00 00 Parts and accessories (not specified or included elsewhere in this Chapter) for machines