Pranata, A., Septiari, R. and Lestarining B, D. W. (2026) “PERANCANGAN KONSEPTUAL SAFETY HELMET 4 IN 1 BERDASARKAN KEBUTUHAN PEKERJA MANUFAKTUR BAHAN BANGUNAN”, Jurnal Valtech, 9(2), pp. 152-157. doi: 10.36040/valtech.v9i2.22370.