Procurement Of Materials And Implementation Of Retrofitting And Improvement Operations For 12 Buildings Of The Tbs Pressure Reduction Station In Qazvin Province (Tender Number: 1402-39) One-Stage Public With Qualitative Assessment (Comprehensive) Procurement Of Materials And Implementation Of Retrofitting And Improvement Operations For 8 Buildings Qazvin Shahr Ring Tbs Pressure Reducing Station (Tender Number: 1402-21) (Renewal) Public One-Stage With Quality Assessment (Compressed) (EXPIRED)