Robert Walkiewicz

42.12.Z - Works related to the construction of railways and underground railways

42.99.Z - Works related to the construction of other civil engineering and water engineering objects, not classified elsewhere

43.13.Z - Performing excavations and geological-engineering drilling

43.21.Z - Installation of electrical systems

43.22.Z - Installation of plumbing, heating, and air-conditioning systems

43.23.Z - Installation of insulation

43.50.Z - Specialized construction works in the field of civil and water engineering