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 22 Apparatus based on the use of X-rays or of alpha, beta or gamma radiations, whet 90 22 12 90 22 12 00 Commodity Code Description 90 22 12 00 00 -- Computed tomography apparatus 90 22 13 00 00 -- Other, for dental uses 90 22 14 00 00 -- Other, for medical, surgical or veterinary uses 90 22 19 00 00 -- For other uses 90 22 21 00 00 -- For medical, surgical, dental or veterinary uses 90 22 29 00 00 -- For other uses 90 22 30 00 00 - X-ray tubes 90 22 90 00 00 - Other, including parts and accessories