12. The following statutes are hereby repealed but only with respect to tangible personal property used in business for the year 1968 and thereafter.
a. Sections 4, 5, 6, 12 and 13 of chapter 51 of the laws of 1960 and all amendments of such sections;
b. Sections 54:4-9 and 54:4-11 of the Revised Statutes and all amendments of such sections;
c. Chapter 141 of the laws of 1964 and all amendments and supplements thereto.