9017.20.40

Drawing, marking-out or mathematical calculating instruments (for example, drafting machines, pantographs, protractors, drawing sets, slide rules, disc calculators); instruments for measuring length, for use in the hand (for example, measuring rods and tapes, micrometers, calipers), not specified or included elsewhere in this chapter; parts and accessories thereof: Other drawing, marking-out or mathematical calculating instruments: Disc calculators, slide rules and other mathematical calculating instruments