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 (Oct. 2026), 152-157. DOI:https://doi.org/10.36040/valtech.v9i2.22370.