Oficialūs aprašymai pateikiami originalo kalba (anglų).
This class includes: - manufacture of millstones, grindstones, grinding wheels, etc., without frameworks, for grinding, sharpening, trueing or cutting, hand sharpening or polishing stones
This class also includes: - manufacture of natural or artificial abrasive powder or grain, on a base of textile material, of paper, of paperboard or of other materials, whether or not cut to shape or sewn or otherwise made