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TBM Kalvarayan (S 1331) Breakthrough at Perambur Metro (South) shaft
Phase II/CP30/TU-01/ – TBM Kalvarayan (S 1331) Breakthrough at Perambur Metro (South) shaft
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ISO 9001:2015 and ISO 14001:2015 Certified
ISO 9001:2015 and ISO 14001:2015 Certified
ISO 9001:2015 and ISO 14001:2015 Certified
