- 23 - Manufacture of coke, refined petroleum products and nuclear fuel
- 23.1 - Coke (24)
- 23.10 - Coke (46)
- 23.2 - Petroleum products (569)
- 23.20 - Manufacture of petroleum products (3715)
- 23.3 - Manufacture of Nuclear Materials (5)
- 23.30 - Manufacture of nuclear material (71)