19 Building and construction materials, not of metal; refractory building and construction materials, not of metal; refractory ceramic shaped parts and refractory ceramic compounds; refractory ceramic masses; refractory ceramic workpieces; refractory bricks (not of metal); refractory shapes (not of metal); refractory moulded parts (not of metal); refractory ceramic molding compounds and castings; refractory ceramic parts, including composite parts; refractory ceramic mixtures; refractory cement; refractory mortar (nonmetallic); refractory furnace linings (non-metallic); the following goods not of metal and in particular for use in machines for casting molten metals or for use in machines for the flow control of molten metals: stopper rods, monoblock stoppers, nozzles, ladle shrouds, tubes and slide gate plates; parts and fittings for all of the aforesaid goods, included in this class