Explanatory notes
… in particular : (1) Millstones and grindstones , often of considerable size, for crushing, grinding, pulping, etc., … grindstones). (2) Grindstones for sharpening cutlery, tools, etc. , and designed for mounting on hand, pedal or … cutting teeth, flutes, grooves, etc., which retain their identity and function even after application of the abrasive …