1. G-Drill/LESS Engineering, Thessalonikis 30, Agios Ioannis Rentis, GR-18233 Pireaus, Greece
2. FEAC Engineering P.C., GR-26442 Patras, Greece
3. Department of Mechanical Engineering Educators, School of Pedagogical and Technological Education (ASPETE), GR-15122 Marousi, Greece