Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4902, 74-4913 and 74-4915, any former member of the Kansas public employees retirement system who was employed by a participating employer on January 1, 1947, until January 8, 1951, and was again employed by the same participating employer on January 10, 1955, until January 9, 1961, and was employed by another participating employer on January 1, 1962, until April 15, 1969, shall be reinstated as a member of the Kansas public employees retirement system and shall receive participating service credit for all service for which contributions remain on deposit with the system. Said member shall also be granted prior service credit for all service with participating employers prior to January 1, 1962. Prior service benefits shall be computed by using a prior service annual salary of eight thousand sixty-two dollars and fifty cents ($8,062.50).