This class includes: - manufacture of permanent magnets and articles intended to become permanent magnets after magnetisation, of materials other than metal (e.g. agglomerated ferrite) - manufacture of ceramic wares for laboratory, chemical or other technical uses
This class excludes: - manufacture of refractory ceramic goods, see 23.20 - manufacture of ceramic building materials, see 23.3 - manufacture of artificial stone (e.g. cultured marble), see 23.66