Open Procedure, Pursuant To Article 71 Of Legislative Decree 36/2023 And Ss.Mm.Ii., Divided Into 3 Lots, For The Assignment, By Framework Agreements With Multiple Economic Operators For Each Lot, Pursuant To Art. 59, Paragraph 4, Of Legislative Decree 36/2023 And Ss.Mm.Ii., Of The Supplies Of Products Necessary For Research And Teaching Activities And For The Functioning Of The Dst Laboratories