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 21 Orthopaedic appliances, including crutches, surgical belts and trusses; splints Commodity Code Description 90 21 10 90 21 21 90 21 29 90 21 31 90 21 39 90 21 40 90 21 50 90 21 90