DOUBLE TUBES(OUTER TUBE OF CU & INNER TUBE OF 90: 10 CU: NI) AS PER TECHNICAL ANNEXURE-A & BHEL QAP, DOUBLE TUBES (OUTER TUBE OF CU & INNER TUBE OF 90: 10 CU: NI) AS PER TECHNICAL ANNEXURE-B & BHEL QAP, DOUBLE TUBES(OUTER TUBE OF CU & INNER TUBE OF 90: 10 CU: NI) AS PER TECHNICAL ANNEXURE-C & BHEL QAP
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