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Manullang, William Kevin Feriyanus (2025) Optimalisasi Raw Material Pada Proses Produksi Knalpot Mobil (Studi Kasus: PT ELYSIUM AUTOTECH). (Optimization of Raw Materials in the Car Exhaust Production Process (Case Study: PT ELYSIUM AUTOTECH)). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.