Manufacture of prefabricated structural components for building or civil engineering of cement, concrete or artificial stone
manufacture of building material materials of vegetable substances (e.g. wood wool, straw, reeds, rushes, etc., agglomerated with cement, plaster or other mineral binder)
Pembuatan komponen struktur pasang siap untuk bangunan atau kejuruteraan awam dari simen, batu atau konkrit buatan