Jacek Trzeciakiewicz

24.20.Z - Manufacture of tubes and pipes, conduits, closed sections andconnectors, of steel

41.20.Z - Building works related to erection of residential and non-residential buildings

43.21.Z - Electrical installation

43.22.Z - Plumbing, heat and air-conditioning installation

43.29.Z - Other construction installation

46.69.Z - Wholesale of other machinery and equipment

46.74.Z - Wholesale of hardware and plumbing and heating equipment and supplies

68.20.Z - Rental and operating of own or leased real estate

70.22.Z - Business and other management consultancy activities

71.12.Z - Engineering activities and related technical consultancy

71.20.B - Other technical testing and analysis

74.90.Z - Other professional, scientific and technical activities not elsewhere classified

78.30.Z - Other human resources provision

82.30.Z - Organisation of conventions and trade shows

85.59.B - Other out-of-school forms of education, not elsewhere classified

96.09.Z - Other personal service activities not elsewhere classified