68 | Articles of stone, plaster, cement, asbestos, mica or similar materials |
6804 | Millstones, grindstones, grinding wheels and the like, without frameworks, for grinding, sharpening, polishing, trueing or cutting, stones hand sharpening or polishing and parts thereof, of natural stone, of agglomerated |
680423 | Other millstones, grindstones, grinding wheels and the like, of natural stone |
6804230000 | Other millstones, grindstones, grinding wheels and the like, of natural stone |