Select Categories OG 1: civil and industrial buildings OG 2: restoration and maintenance of property subject to protection OG 3: roads, motorways, bridges, viaducts, railways, subways, etc. OG 4: works of art in the subsoil OG 5: dams OG 6: aqueducts, gas pipelines, oil pipelines, etc. OG 7: maritime and drainage works OG 8: river, defence, hydraulic and reclamation works OG 9: plants for electricity production OG 10: plants for high/medium voltage transformation, etc. OG 11: technological systems OG 12: works and plants for reclamation and environmental protection OG 13: naturalistic engineering works OS 1: ground works OS 2-A: decorated surfaces and movable and immovable property belonging to the cultural heritage of historical interest OS 2-B: movable cultural assets of archival and book interest OS 3: water-sanitary, kitchens and laundries systems OS 4: electro-mechanical conveyor systems OS 5: pneumatic and anti-intrusion systems OS 6: finishes of general works in wood, plastic, metal and glass materials OS 7: finishes of general construction works OS 8: waterproofing works OS 9: systems for luminous signs and traffic safety OS 10: non-luminous road signs OS 11: special structural equipment OS 12-A: road safety barriers OS 12-B: rockfall barriers and the like OS 13: prefabricated reinforced concrete structures OS 14: waste disposal and recovery plants OS 15: cleaning of sea, lake and river waters OS 16: electricity production plants OS 17: telephone lines and telephone systems OS 18-A: structural steel components OS 18-B: components for curtain walls OS 19: telecommunications network systems for data transmission OS 20-A: topographic surveys OS 20-B: geognostic surveys OS 21: special structural works OS 22: purification plants OS 23: demolition of structures OS 24: green and street furniture OS 25: archaeological excavations OS 26: special floors and superstructures OS 27: electrical traction systems OS 28: heating and air conditioning systems OS 29: permanent way material OS 30: internal electrical, telephone, radiotelephone and television systems OS 31: lifting and handling systems OS 32: wooden structures OS 33: special covers OS 34: anti-noise systems mobility infrastructures OS 35: interventions with low environmental impact
