Building of highways, roads, streets, pavements and other roads for vehicles and pedestrians (including the setting of guard rails)
Terracing work: digging, grading of construction sites, opening of trenches, removal of rocks, destruction with explosives, etc.
Ground-water lowering and dredging of construction sites
Dredging of agricultural and silvicultural lands
Activities of construction economist
Systematic studies and creation efforts in different kind of research-development in mathematics and natural sciences (physics, astronomy, chemistry, medical sciences, biology, etc.)
Activities of disinfection and destruction of parasites in buildings, ships, trains, etc.
Cutting of trees and hedges
Dredging
Drilling and pre-drilling
Other types of specialised building activities
Intermediation of common goods
Non-specialised wholesale
Other types of retail trade in new goods in specialised shops
Trade in own real estate
Engineers and similar technical advisors, with the exception of surveyors
Other types of technical surveys and checks
Other types of technical and scientific activities