European Open Procedure In Electronic Mode, Pursuant To Art. 71 Of Legislative Decree 36/2023, For The Assignment Of The Management Service, Periodic Checks, Ordinary And Extraordinary Non-Programmable Maintenance And Emergency Intervention Of Hydraulic, Inert Gas, Potassium Aerosol Fire Prevention Systems, Fire Doors And Accessories, Emergency Exits, Portable And Wheeled Fire Extinguishers,