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A Defect analysis on R8 cover product using six sigma method at PT Amtek Engineering. Jurnal Manajemen Rekayasa dan Inovasi Bisnis [Internet]. 2026 Aug. 30 [cited 2026 Sep. 1];5(1):69-85. Available from: https://journal.iteba.ac.id/index.php/jmrib/article/view/866