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Sinaga, Heru Ambrose and Suseno, Suseno (2023) UPAYA PENINGKATAN KUALITAS PRODUK MANHOLE DI PT MEGA JAYA LOGAM MENGGUNAKAN METODE SIX SIGMA EFFORTS TO IMPROVE THE QUALITY OF MANHOLE PRODUCTS AT PT MEGA JAYA LOGAM USING THE SIX SIGMA METHOD. Tugas Akhir thesis, University of Technology Yogyakarta.