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690310Chapter 69

Containing, by weight, more than 50 % of free carbon

Description

Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths : Containing, by weight, more than 50 % of free carbon

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