Applying lean tools to identify and eliminate waste in the stone production process at 350T/H stone crusher at Dong Phong Co., Ltd: Faculty of high quality training Graduation's thesis of the Industrial Management/ Nguyen Ngoc Toan; Nguyen Thi Mai Tram (Supervisor)--Ho Chi Minh city: Ho Chi Minh city University of technology and education, 2022 Call no.: QCN-24 658.5 N573-T627