Open Procedure Pursuant To The Combined Provisions Of The Articles. 71 And 153 Of The Legislative Decree. N. 36/2023 Within The Scope Of Application Of The Special Sectors, For The Conclusion Of Framework Agreements Pursuant To Art. 154 Of Legislative Decree. 36/2023 Lasting Three Years And Relating To Individual Lots (No. 8) On The Basis Of Which The Supply Of Spare Parts Necessary For Maintenance Is Entrusted To A Single Economic Operator For Each Lot.