Tax-free bond specification: exemption granted for specified secured redeemable non-convertible bonds subject to holder registration. Specification under section 10(15)(iv)(h) designates the 10 year 9 per cent tax free secured redeemable non convertible bonds issued by the National Thermal Power Corporation Limited as eligible for the tax exemption, subject to the condition that the holder registers his name and holding with the corporation; the specification takes effect for the assessment year commencing 1 April 1992 and subsequent years.