Development of Innovative Mobile QR-EFI Simulator in Problem-Based Teaching Factory (PBTF) Model to Enhance Students' 4C Skills. - Iffarial Nanda; Wakhinuddin Simatupang; Hasan Maksum; Rifdarmon; Lasyatta Syaifullah; Rido Putra (Int. J. Interact. Mob. Technol., 2025)