9031: Measuring or checking inst, appl & mach, nes or incl in this chapter

903110: Machines for balancing mechanical parts, nes 903120: Test benches for measurg or checkg instruments, appliances & machines 903130: Profile projectors, nes 903141: Other Optical Instruments, For Inspecting Semiconductor Wafers or Devices 903149: Optical Instruments, Appliances and Machines For Measuring or Checking, N.e.s 903180: Measuring or checking instruments, appliances and machines, nes 903190: Parts & accessories for measuring or checking inst, appl & machines, 9031: Measuring or checking inst, appl & mach, nes or incl in this chapter