Abrasive wheels for power-operated grinders; grindstones being parts of machines; reamers being parts of machines; gear cutters being machines; end mills being machines; abrasive disks for power-operated grinders; abrasive disks for power-operated lapping machines; honing machines for metalworking; cutting discs for use as parts of machines; glaziers' diamonds being parts of machines; diamond & CBN wheels being power operated tools; superabrasive wheels being power operated tools