CRUCIBLES, CUPELS, SCORIFIERS AND ROASTING DISHES (BOTH THESE TWO DESCRIPTIONS OF GOODS BEING ARTICLES IN THE NATURE OF CRUCIBLES) CRUCIBLE COVERS, STANDS AND STIRRERS, WEDGES, CHLORIN TUBES AND COUPLE TUBES, ALL THE ABOVE MENTIONED GOODS BEING OF FIRE CLAY OR SIMILAR REFRACTORY MATERIAL. CLAY LINERS FOR CRUCIBLES, FIRE BRICKS, PLATES, SLABS, DOMES AND TUBES, ALL SAID GOODS BEING OF CLAY OR SIMILAR REFRACTORY MATERIAL. PATCHING MATERIAL FOR FURNACE WORK OF CLAY OR SIMILAR REFRACTORY MATERIAL. REHAUSSES BEING MUFFLE RINGS OR REMOVABLE TAPS (ACCESSORIES FOR USE WITH CRUCIBLES) OF CLAY OR OTHER REFRACTORY MATERIAL. ALSO CRUCIBLES MADE OF PLUMBAGO OR GRAPHITE AND OTHER LIKE FIRESTANDING GOODS CONSISTING OF MUFFLES, SCORIFIERS, FURNACES AND RETORTS, MADE OF PLUMBAGO OR GRAPHITE