Open Procedure Relating To The Awarding Of The Three-Year Maintenance Service Of Systems In The Rome Offices Of The Ministry Of Infrastructure And Transport. Air Conditioning, Water, Sanitary, Access Control, Electrical And Special Systems, In The Offices Of V.Le Policlinico, 2 And Hangar 151 And 159 Ciampino. Access Control And Special Systems, In The Offices In Via Nomentana, 2 And Via Ca