Romadhon H, Taufik I. DESIGN OF FRAME, PICKUP AND BATTERY PLACE PROTOTYPE OF ELECTRIC FOLDING BIKE FOR PRODUCTION USING SAND CASTING. Elemen [Internet]. 2025 Dec. 28 [cited 2025 Dec. 29];12(2). Available from: https://je.politala.ac.id/index.php/JE/article/view/322