On the effective date of this act, the following shall be eligible employers as defined in K.S.A. 74-4902 (13), and amendments thereto, and as further defined herein:
(1) Kansas public school districts;
(2) Kansas technical colleges;
(3) Kansas community junior colleges; or
(4) the state of Kansas for state agencies having employees who are members of the state school retirement system on December 31, 1970.
Such eligible employers shall become participating employers as defined in K.S.A. 74-4902 (24), and amendments thereto. The entry date into the Kansas public employees retirement system of such eligible employers shall be January 1, 1971.