0 0 6804 Millstones, grindstones, grinding wheels and the like, without frameworks, for milling, grinding, pulping, sharpening, polishing, trueing or cutting, hand sharpening or polishing stones, and parts thereof, of natural stone, of agglomerated natural or artificial abrasives, or of ceramics, with or without parts of other materials (excl. perfumed pumice stones and grinding wheels etc. specifically for dental drill engines)