"Providing Services: A) Maintenance-Technical Support And Good Operation Of The Electrical And Plumbing Installations Of The Buildings On Akadimias 40, Patision 34-Solomou-Kanygos 29 (Where Required) In Athens, Of The Piraeus Branch On 12 Iakovou Dragatsi Street, Of The Patras Branch On 6 Agios Andreas Street In Patras, Of The Thessaloniki Branch On Of 35 Ermou And Karolou Streets In Thessaloniki, As Well As Twelve Smaller Properties In The Athens Basin, For Two (2) Years And B) Maintenance Of Boiler Room Facilities, Control And Measurement Of Flue Gases Of Boilers - Burners, Maintenance Of The Natural Gas Network And The Natural Gas Detection System Of The Building On 40 Akadimias Street In Athens For Two (2) Years, As Well As Supply Of Materials And Execution Of Works For Repair Of Damage To The Above-Mentioned Facilities And Machines"