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, medical or surgical instruments and apparatus; parts and accessories thereof 90 10 Apparatus and equipment for photographic laboratories, nes 90 10 60 Projection screens Commodity Code Description 90 10 60 00 Projection screens