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Suherman, Syafii Nur Aziz and , Agung Setyo Darmawan, ST. MT (2023) Effect of Variations 2.466, 2.981, 3.304, and 3.363% Weight of Silicone in Gray Cast Iron on Chemical Composition, Micro Structure, and Brinell Hardness. Skripsi thesis, Universitas Muhammadiyah Surakarta.