33220 - Malleable iron foundries (Miscellaneous)
33221 - Standard malleable iron castings
33222 - Pearlitic malleable iron castings
3322299 - - Pearlitic malleable iron castings
3322XX0 - - Malleable iron foundries (Miscellaneous - Volume)
3322XX2 - - Malleable iron foundries (Miscellaneous - Speciality)