ZEN - Zakład Instalacyjno-Budowlany-Duszyński Zenon

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

43.11.Z - Demolition and destruction of buildings

43.21.Z - Installation of electrical systems

43.23.Z - Installation of insulation

43.24.Z - Installation of other building systems

43.31.Z - Plastering

43.32.Z - Installation of building carpentry

43.33.Z - Flooring, wallpapering, and cladding of walls

43.34.Z - Painting and glazing

43.41.Z - Performing roof structures and coverings

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

49.41.Z - Road freight transport

77.32.Z - Rental and leasing of construction machinery and equipment