 | | 35. Reconnaissance, prospection and exploration of geological resources |
 | | 36. Surface mining |
 | | 37. Underground mining |
 | | 38. Minerals-handling and processing |
 | | 39. Petroleum and natural gas - Exploration, production, handling, storage |
 | | 40. Coking plants, coal-to-gas plants, gas production and distribution |
 | | 41. Thermal power stations |
 | | 42. Power transmission and distribution |
 | | 43. Renewable sources of energy |