Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4913 to the contrary, if an employee of a participating employer became a member of the Kansas public employees retirement system on January 1, 1962, was first employed by the participating employer on November 10, 1952, and was re-employed by the participating employer on April 1, 1961, he shall be granted prior service credit for all service with his entry date employer prior to January 1, 1962, whether continuous or not. This additional credit shall affect only those benefit payments due after the effective date of this act.