Mumbai, Nov. 15 -- The benchmark index of Bombay Stock Exchange (BSE) on Friday gained further by 70.21 points to 40,356.69 on brisk buying in Materials, Finance, Telecom and Bankex stocks. The Nifty of National Stock Exchange (NSE) too rose by 23.20 points to 11,895.30. In opening session the Sensex rallied by 122 points to 40,408.20. During the day, it spurted by 364 points to 40,650.06, day high. In late trade, it erased earlier gain but manged to end positive only at 40,356.69, registering a small gain of 70.21 points from its last close. The sectoral indices that supported the market were Materials, Finance, Telecom, Bankex and Technology while selling in Power, Utilities, Auto and IT stocks capped from further gain, broker informed....