1. KOMAG Institute of Mining Technology, Pszczyńska 37, 44-100 Gliwice, Poland
2. Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
3. Department of Technical Systems Operation and Maintenance, Faculty of Mechanical Engineering, Wyspianskiego 27, 50-370 Wrocław, Poland
4. Faculty of Electrical Engineering, Silesian University of Technology, Akademicka 10A, 44-100 Gliwice, Poland
5. Center of Foreign Languages, Silesian University of Technology, Akademicka 2, 44-100 Gliwice, Poland