Oskar ZIELIŃSKI

43.24.Z - Installation of other building systems

33.12.Z - Repair and maintenance of machinery

33.15.Z - Repair and maintenance of civilian ships and boats

33.18.Z - Repair and maintenance of military combat vehicles, ships, boats, aircraft, and spacecraft

33.20.Z - Installation of industrial machinery, equipment, and devices

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

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

43.35.Z - Performing other finishing construction works

43.42.Z - Performing other specialized construction works related to the construction of buildings

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

91.30.Z - Conservation and restoration activities and other supporting activities for cultural heritage