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Preventive And Corrective Maintenance Of Sub-Station Equipments Of 2 Nos. Of 500 Kva Tr-1 - 6Kv/420V And Tr-2 - 6Kv/415V Oil Type Transformers And 3 Nos. Of 11 Kv Htoc Breakers Inside City Civil Court Building Sub-Station, Kolkata. Wbpwd/Ae-Nsesd/Niq-89/2025-26
