… muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of …
Explanatory notes
… muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of … crucibles, cupels and similar articles for industrial or laboratory use, muffles, nozzles, plugs, burner jets and …