Setiawan, Arif, Dedy Pradigdo, and Farid Hendro Wibowo. 2021. “The GRINDER CONSTRUCTION DESIGN OF A BALL MILL MACHINE FOR THE PROCESS OF HOMOGENIZING BLACK POWDER USING AN AUTOMATIC SYSTEM”. Jurnal Otoranpur 2 (2):22-28. https://doi.org/10.54317/oto.v2iOktober.187.