Hubert Mastalerz

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

25.51.Z - Coating of metals

25.53.Z - Mechanical processing of metal parts

33.12.Z - Repair and maintenance of machinery

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

42.22.Z - Works related to the construction of telecommunications and electrical lines

43.21.Z - Installation of electrical systems

43.24.Z - Installation of other building systems

43.34.Z - Painting and glazing

43.35.Z - Performing other finishing construction works

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

43.99.Z - Other specialized construction works, not classified elsewhere

81.22.B - Other cleaning of buildings and industrial premises, not elsewhere classified