Tender for 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. in Calcutta - West Bengal

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