Putri IAA, Sitania FD, Sukmono Y. Preventive Maintenance Analysis to Improve the Readiness of Heavy Equipment Hydraulic Excavator Liebherr R9250 & R9350 with Six Sigma Method at PT. XYZ. IJIEM [Internet]. 2025 Mar. 20 [cited 2026 May 28];5(3):701-1. Available from: https://training-ojs3-publikasi.mercubuana.ac.id/index.php/ijiem/article/view/22917