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Kurniawan, D., S. Safril, and B. Bukhari. “RANCANG BANGUN MESIN PUNTIR UNTUK PEMBUAT BESI TERALIS MODEL SPIRAL SPESIFIKASI BESI KOTAK 10X10X1000 Mm”. Jurnal Teknik Mesin, Vol. 11, no. 1, July 2019, pp. 16-21, http://ejournal2.pnp.ac.id/index.php/jtm/article/view/174.