Exploratory Notice For Expression Of Interest, Aimed At Identifying Economic Operators To Invite To The Negotiated Procedure Pursuant To Art. 50 Paragraph 1, Letter E) Of The Legislative Decree. 36/2023 For The Awarding Of The Maintenance Service Of Retractable Mobile Bollards Placed To Close Pedestrian Areas And Z.T.L. Of The Municipality Of Mantova For Four Years