… marking-out or mathematical calculating instruments (for example, drafting machines, pantographs, protractors, … instruments for measuring length, for use in the hand (for example, measuring rods and tapes, micrometers, callipers), …
Explanatory notes
… marking‑out or mathematical calculating instruments (for example, drafting machines, pantographs, protractors, … instruments for measuring length, for use in the hand (for example, measuring rods and tapes, micrometers, callipers), … in drawing sets to the complex protractors as used, for example, in engineering. (6) Stencils of a kind clearly …