| Class 2320: Manufacture of refractory products |
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| This class includes the manufacture of intermediate products from mined or quarried non-metallic minerals, such as sand, gravel, stone or clay.
This class includes: - manufacture of refractory mortars, concretes etc. - manufacture of refractory ceramic goods: • heat-insulating ceramic goods of siliceous fossil meals • refractory bricks, blocks and tiles etc. • retorts, crucibles, muffles, nozzles, tubes, pipes etc. |