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, photographic, cinematographic, measuring, checking, precision, me Thereof. 90 22 Apparatus based on the use of X-rays or of alpha, beta or gamma radiation, whether or not for medical, surgical, dental or veterinary uses, including radiography or radiotherapy apparatus, X-ray tubes and other X-ray generators, high tension generators, control panels and desks, screens, examination or treatment tables, chairs and the like Commodity Code Description 90 22 12 - - Computed tomography apparatus 90 22 13 - - Other, for dental uses 90 22 14 - - Other, for medical, surgical or veterinary uses 90 22 19 - - For other uses 90 22 21 - - For medical, surgical, dental or veterinary uses 90 22 29 - - For other uses 90 22 30 - X-ray tubes 90 22 90 - Other, including parts and accessories