MTNL Standalone December 2018 Net Sales at Rs 514.20 crore, down 11.36% Y-o-Yhttps://www.moneycontrol.com/news/business/earnings/mtnl-standalone-december-2018-net-sales-at-rs-514-20-crore-down-11-36-y-o-y-3550601.html#MTNL