§ 6163.
Extension of time for payment of estate tax on value of reversionary or remainder interest in property
([Aug. 16, 1954, ch. 736], [68A Stat. 763]; [Pub. L. 85–866, title I, § 66(b)(1)], Sept. 2, 1958, [72 Stat. 1658]; [Pub. L. 88–272, title II, § 240(a)], Feb. 26, 1964, [78 Stat. 129]; [Pub. L. 93–625, § 7(d)(1)], Jan. 3, 1975, [88 Stat. 2115]; [Pub. L. 94–455, title XIX, § 1906(b)(13)(A)], title XX, § 2004(c)(3), Oct. 4, 1976, [90 Stat. 1834], 1868.)