23.20 - Manufacture of refractory products
23.20.11 - Bricks, blocks, tiles and other ceramic goods of siliceous fossil meals or earth
23.20.12 - Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than of siliceous fossil meals or earths
23.20.13 - Refractory cements, mortars, concretes and similar compositions n.e.c.
23.20.14 - Unfired refractory products and other refractory ceramic goods
Manufacture of refractory products
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