Ohio Rev. Code § 3375.411
A board of library trustees of a free public library, appointed pursuant to the provisions of sections 3375.06, 3375.08, 3375.12, 3375.15, and 3375.22 of the Revised Code, which has not less than seventy-five full-time employees, and which, prior to September 16, 1943, was providing for retirement of the employees of such library with annuities, insurance, or other provisions, under authority granted by former section 7889 of the General Code, may provide such retirement, insurance, or other provisions in the same manner authorized by former section 7889 of the General Code, as follows: the library board of such library which has appropriated and paid the board's portion provided in such system or plan, may continue to appropriate and pay the board's portion provided in such system or plan out of the funds received to the credit of such board by taxation or otherwise. Each employee of such library who is to be included in a system of retirement shall contribute to the retirement fund not less than four per cent per annum of the employee's salary from the time of eligibility to join the retirement system to the time of retirement. If a group insurance plan is installed by any library, not less than fifty per cent of the cost of such insurance shall be borne by the employees included in such plan.
Provided, any employee whose employment by said library began on or after September 16, 1943, may exempt self from inclusion in such retirement system, or withdraw from such retirement system. Upon such exemption or withdrawal, such person shall become a member of the public employees retirement system in accordance with former section 145.02 and sections 145.03 and 145.28 of the Revised Code, respectively. All employees appointed for the first time on and after January 1, 1956, shall, for retirement purposes, be eligible only for membership in the public employees retirement system as provided in Chapter 145. of the Revised Code.
A library board which provides for the retirement of its employees with annuities, insurance, or other provisions under the authority granted by this section may, pursuant to a board resolution adopted within thirty days after the effective date of this section, terminate such retirement plan. Upon the effective date of such termination, which is specified in the resolution, each employee covered by such retirement plan shall become a member of the public employees retirement system.
R.C. § 3375.411