Description
Class B24D : TOOLS FOR GRINDING, BUFFING, OR SHARPENING
Subclass 3/12: Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents (composition of friction linings F16D 69/02) the constituent being used as bonding agent and being essentially inorganic water-setting, e.g. concrete