ONGC-  OIL AND NATURAL GAS CORPORATION

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NTPC-  NATIONAL THERMAL POWER CORPORATION

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GAIL GAS AUTHORITY OF INDIA LIMITED

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BHEL BHARAT HEAVY ELETRICALS LIMITED

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BEL BHARAT ELETRONICS LIMITED

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BDL BHARAT DYNAMICS LIMITED

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IOCL INDIAN OIL CORPORATION LIMITED 

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HPCL HINDUSTAN PETROLIUM  CORPORATION LIMITED 

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