HAND TOOLS, namely, - SHARPENING STONES, HONES, OILSTONES [ ; AND HAND-OPERATED GRINDING, CUTTING, POLISHING, AND ABRADING WHEELS ]

Abrasive Products-Namely, Powders, Grains, Pastes, Stones, Hones, Oilstones, Valve-Grinding Compounds, and Grinding, Cutting, Polishing, and Abrading Wheels

Heat-Refractory Materials, Consisting of Alumina, Silicon Carbide, or Mixtures of Either of These Materials with a Ceramic Bonding Material.

Refractory Bricks or Blocks.

Heat-Refractory Plates, Tubes, Muffles, Crucibles, and Dishes, ADAPTED FOR USE IN LABORATORIES

Abrasives, Abrasive Wheels, Polishing and Grinding Grains, Powders, Tools, and Implements, Oilstones, and Whetstones