RAHMAWATI, Isadora; WIBISONO, Dermawan. Proposed Improvements of Air Conditioner Preventive Maintenance In The Coal Mining Industry By Utilizing DMAIC Methodology . Dinasti International Journal of Education Management and Social Science, [S. l.], v. 7, n. 1, p. 1073–1086, 2025. DOI: 10.38035/dijemss.v7i1.5555. Disponível em: https://www.dinastipub.org/DIJEMSS/article/view/5555. Acesso em: 25 apr. 2026.