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Bids Are Invited For Hiring A Specialized Company Or Consortium Of Companies To Carry Out Renovation, Recovery And Maintenance Services For Tunneling Machines 1 And 2 (Tbm – Tunnel Boring Machine), As Well As Their Peripherals And Energy Supply Systems, Necessary For The Execution Of Services On The East Line Of The Fortaleza Metro – Phase 1, Including The Execution Of The Prolonged Shutdown Procedure.