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Mudakkir, Achmad Nurman (2022) Penjadwalan Preventive Maintenance Mesin Penghancur Batu Pada PT. Benteng Api Technic dan Pengaplikasian Standar Operasional Prosedur (Scheduling Preventive Maintenance Stone Crusher Machine at PT. Fortress Technic and Application of Standard Operating Procedures). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.