… 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, …
Explanatory notes
… marking‑out or mathematical calculating instruments (for example, drafting machines, pantographs, protractors, … photoresist coated substrates (such as optical, E-beam, focused ion beam, X-ray or laser beam apparatus) ( heading … etc.). (5) Protractors , from the ordinary protractors found in drawing sets to the complex protractors as used, …