Procurement: Acquisition Of Lac Astm A500 Steel Tube Goods, For The Project "Improvement And Expansion Of The Primary And Secondary E.B.R. Services Of The I.E. Nuestra Señora De Belén In The District Of Calca - Province Of Calca - Department - Procurement: Acquisition Of Goods Of Lac Astm A500 Steel Tube, For The Project "Improvement And Expansion Of E.B.R. Services." Primary And Secondary Of The I.E. Our Lady Of Bethlehem In The District Of Calca - Province Of Calca - Department Of Cusco"