ABRASIVE AND POLISHING GRANULES AND POWDERS; PAPER, CLOTH AND VULCANIZED FIBER WITH ABRASIVE OR POLISHING GRANULES OR POWDERS ADHESIVELY ATTACHED THERETO; AND ABRASIVE WHEELS, STONES, AND BLOCKS

FILTER PLATES, FILTER TUBES, DIFFUSER PLATES, DIFFUSER TUBES, AND POROUS DIAPHRAGMS, LABORATORY WARE FOR FILTERING PURPOSES, AND PORDUS MEDIUMS