… Millstones, grindstones, grinding wheels and the like, … of natural stone, of agglomerated natural or artificial abrasives, or of ceramics, with or without parts of other …
Explanatory notes
… 68.04 - Millstones, grindstones, grinding wheels and the like, … etc. Grinding stones, grinding wheels, etc., must be made essentially of natural stone, agglomerated or not, (e.g., … sometimes with added feldspar), sodium silicate, cement (especially magnesian cement) or less rigid cementing …