… disc calculators); instruments for measuring length, for use in the hand (for example, measuring rods and tapes, …
Explanatory notes
… disc calculators); instruments for measuring length, for use in the hand (for example, measuring rods and tapes, … does not , however, include : (a) Mitre boxes and tools used in the graphic arts (e.g., chisels, gouges, etching … plotting in navigation. (2) Drafting machines generally using a system of parallelograms, with or without drawing …