Thitinun Pongnam <p>Department of Mechanical Technology Education (Farm Mechanics), Faculty of Technical Education, Rajamangala University of Technology Khon Kaen Campus, Khon Kaen</p> Thailand
Banlu Phiachin <p>Department of Mechanical Technology Education (Farm Mechanics), Faculty of Technical Education, Rajamangala University of Technology Khon Kaen Campus, Khon Kaen</p> Thailand
Banjob ChamChong Department of Civil Engineering, Faculty of Engineering, NorthEastern University, Khon Kaen Thailand
Parinya Thaweephun Public Works Administration Officer, Subdistrict Municipality Phra Lap, Amphoe Mueang Khon Kaen Thailand