THE EFFECT OF USE OF DUAL BED CATALITIC CONVERTER WITH COPPER AND BRASS ON NOISE LEVEL AND MACHINE PERFORMANCE. Machine : Jurnal Teknik Mesin, [S. l.], v. 6, n. 2, p. 12–17, 2020. DOI: 10.33019/jm.v6i2.1436. Disponível em: https://www.journal.ubb.ac.id/index.php/machine/article/view/1436. Acesso em: 7 may. 2026.