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Andhra Pradesh Power Generation Corporation Limited
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Gujarat Water Supply & Sewerage Board
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Mecon Limited
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Chhattisgarh State Power Distribution Company Limited
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Tamil Nadu Transmission Corporation Limited
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Engineers India Limited
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Defence Research & Development Laboratory
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NMDC Limited
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PGCIL Approval Letter
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NTCP Limited
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Chennai Petroleum Corporation Limited
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Bharat Heavy Electrical’s Limited
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Electrical PWD Rajashtan
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AAI Approval