Supply And Installation Of Structures For The Service And Protection Of Visitors And The Highlighting Of Detached Antiquities In The Courtyard Of The Preserved Barracks Building A3 In The Former Camp Of Pavlos Melas In Thessaloniki, In The Context Of The Project "Sub. 3.20 Restoration And Reuse Of The A3 Barracks Building As A Museum Of Thessaloniki Metropolitan Railway Artifacts".