… of natural stone, of agglomerated natural or artificial abrasives, or of ceramics, with or without parts of other …
Explanatory notes
… of natural stone, of agglomerated natural or artificial abrasives, or of ceramics, with or without parts of other … for milling grain (upper or lower stones); pulping wood, asbestos, etc.; paper-makers’ or paint mixers’ grindstones). … a ribbed surface. They may be in one piece or made up of assembled segments, be fitted with sockets, internal or …