Section 18 PREPARED FOODSTUFFS; BEVERAGES, SPIRITS AND VINEGAR; TOBACCO AND MANUFACTURED TOBACCO SUBSTITUTES Section notes 90 optical, photographic, Cinematographic, Measuring, Checking, Precision,Medical or Surgicla Instruments and Apparatus; parts and AccesoriesThereof. 91 Clocks and watches and parts thereof 92 Musical instruments; parts and accessories of such articles