NL Corresspondent Hyderabad, May 17: India’s largest producer of iron ore, NMDC organised a session on Preventive Vigilance at its headquarters in Hyderabad today. The Keynote Address was delivered by Dr. Praveen Kumari Singh, Additional Secretary, Central Vigilance Commission. Shri Dilip Kumar Mohanty, Director (Production) and Shri B. Vishwanath, CVO were present at the event,