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, PHOTOGRAGHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 31 MEASURING OR CHECKING INSTRUMENTS, APPLIANCES AND MACHINES, 90 31 41 OTH.OPTICAL INST.&APPL.FOR INSPECTING SEMICONDUCTOR WAFERS/DEVICES/FOR Commodity Code Description 90 31 41 00 OTH.OPTICAL INST.&APPL.FOR INSPECTING SEMICONDUCTOR WAFERS/DEVICES/FOR