ANALYSIS OF WORK EFFICIENCY ON MAINTENANCE OF CRITICAL BELT CONVEYOR MACHINE COMPONENTS USING THE PREVENTIVE MAINTENANCE APPROACH AT PT VARIA USAHA BETON BRANCH BATANG. G-Tech [Internet]. 2023 Mar. 20 [cited 2026 Oct. 8];7(2):563-9. Available from: https://ejournal.uniramalang.ac.id/g-tech/article/view/2326