Request For Quotes From Several Business Operators For Any Direct Assignment, Referred To In Art. 3, Letter D) Of Annex I.1 Of Legislative Decree No. 36 Of 31 March 2023 And Pursuant To Art. 50, Paragraph 1, Lett. B) Of The Same Decree, For The Rental Of Flow Meters Complete With Accessories For The Patient'S Oxygen Humidification Procedure And Oxygen Heaters Complete With Accessories