Retorts, crucibles, mufflers, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and other refractory ceramic goods (excl. those of siliceous fossil meals or of similar siliceous earths, articles of heading 6902, articles containing carbon, alumina or silica of subheading 6903.10.00 and 6903.90.10)(2004-2500);Retorts, crucibles, mufflers, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and other refractory ceramic goods (excl. those of siliceous fossil meals or similar siliceous earths, of heading 6902, containing > 25 % carbon or containing > 50% by weight of alumina or a mixture or compound of alumina and silica)(1988-1993)

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