9017: Drawing, marking-out/mathematical calculating inst, inst for meas len

901710: Drafting tables and machines, whether or not automatic 901720: Drawing, marking-out or mathematical calculating instruments, nes 901730: Micrometers, callipers and gauges 901780: Instruments for measuring length, for use in the hand, nes 901790: Parts and accessories for use with the apparatus of heading No 90.17 9017: Drawing, marking-out/mathematical calculating inst, inst for meas len