Electronic Auction - Hiring A Specialized Company To Provide Preventive And Corrective Maintenance Services On Distribution Rings, Water Mains And Sub-Water Mains, Including Connections, Valves And Appliances Made Of Cast Iron, Carbon Steel And Pvc De Fofo, With Diameters From 400Mm To 1400Mm In The Metropolitan Region Of São Luís And Br-135 (Km 0 To Km 56), According To Specifications, Quantities And Other Conditions Described In The Term Of Reference (Annex I) Of This Notice. (EXPIRED)