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Pradana, Willy Widyaswara (2022) Penjadwalan Preventive Maintenance untuk Meningkatkan Kinerja Mesin Frais dan Bubut di PT. Isumi. (Preventive Maintenance Scheduling to Improve Milling and Lathe Performance at PT. Isumi). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.