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Iffarial Nanda et al. 2025. Development of Innovative Mobile QR-EFI Simulator in Problem-Based Teaching Factory (PBTF) Model to Enhance Students’ 4C Skills. International Journal of Interactive Mobile Technologies (iJIM). 19, 18 (Sep. 2025), 18–31. DOI:https://doi.org/10.3991/ijim.v19i18.57285.