S. 271(1)(c) : Penalty-Concealment-Neither assessment order nor penalty notice specifying the charge-Revised return was filed before issue of notice u/s. 142(1) and 143(2) of the Act-Claiming only statutory deduction-Levy of penalty was held to be not valid. [S. 11(2), 12A, 142(1), 143(2), 274]