Drafting Of The Construction Project And Execution Of The Works For The Renewal Of Pp.Nn In Pp.Kk 4/065 And 4/505 Belonging To Line 754-Sotiello-Puerto El Musel, New Automatic Protection Installation Pp.Nn In Pp.Kk 1/057, 7/749, 275/112 And 277/482, And The Renewal Of Pp.Nn In Pp.Kk. 5/111 And 6/762 Belonging To Line 762-Trubia-S.Esteban De Pravia