of transporting any load other than that particular machinery or equipment or similar machinery or equipment requiring such a specially designed chassis. . (2) Section 4221 of such Code is amended— (A) by striking 4051 or in subsection (a), and (B) by striking and in the case of any article sold free of tax under section 4053(6), in subsection (c). (3) Section 4222(d) of such Code is amended by striking 4053(6), . (4) Section 4293 of such Code is amended by striking section 4051, . (5) Section 6416(b)(2) of such Code is amended by striking or under section 4051 . (6) Section 6416(b) of such Code is amended by striking paragraph (6). (7) Section 9503(b)(1) of such Code is amended by striking subparagraph (B) and by redesignating subparagraphs (C), (D), and (E) as subparagraphs (B), (C), and (D), respectively. (c) Effective date The amendments made by this section shall apply to sales and installations on or after the date of the introduction of this Act.