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 19 Mechano-therapy appliances; massage apparatus; psychological aptitude-testing ap 90 19 10 90 19 10 00 Commodity Code Description 90 19 10 00 00 - Mechano-therapy appliances; massage apparatus; psykchological aptitude-testing apparat 90 19 20 00 00 - Ozone therapy, oxygen therapy, aerosol therapy, artificial respiration or other therap