Designing a Structural Model for Implementing Maintenance 4.0 in Iran’s Oil and Gas Industry with a Sustainability-Oriented Approach Seyed Vali-Allah Hosseini Falehi, Mohammad Jalali Varnamkhasti*, Mohammad Mashhadizadeh, Mansoureh Pourmiri, 10.57647/ijm2c.2026.1604.23 XML Requires Subscription PDF downloads: 12