Heading 9017
Drawing, marking-out, mathematical calculating instruments (drafting machines, protractors, drawing sets etc); instruments for measuring length (e.g. measuring rods, tapes, micrometers, callipers) n.e.c.
901710
Drafting tables and machines; whether or not automatic
901720
Drawing, marking-out or mathematical calculating instruments
901730
Mathematical equipment; micrometers, callipers and gauges
901780
Mathematical instruments and equipment; n.e.c. in heading no. 9017
901790
Drawing, marking-out equipment and mathematical instruments; parts and accessories