… calculating instruments (for example, drafting machines, pantographs, protractors, drawing sets, slide rules, disc … for use in the hand (for example, measuring rods and tapes, micrometers, callipers), not specified or included elsewhere in this Chapter. …
Explanatory notes
… calculating instruments (for example, drafting machines, pantographs, protractors, drawing sets, slide rules, disc … and digitizers ( heading 84.71 ). (c) Pattern generating apparatus designed to produce masks and reticles from … by reference to the condition of the sky, time of day, aperture setting, type of subject and sensitivity of …