Ohio Rev. Code Ann. § 145.37
(A) As used in this section:
(B) To coordinate and integrate membership in the state retirement systems, at the election of a member, total contributions and service credit in all state retirement systems, including amounts paid to restore service credit under sections 145.311, 3307.711, and 3309.261 of the Revised Code, shall be used in determining the eligibility and total retirement or disability benefit payable. When total contributions and service credit are so combined, the following provisions apply:
(1) Age and service retirement shall be effective on the first day of the month immediately following the later of:
(2) Disability benefits shall be effective on the first day of the month immediately following the later of the following:
(3) The board of the paying system shall do both of the following:
(4)
(a) Each transferring system in which the member has service credit shall certify to the paying system all of the following:
(5) In determining the total credit to be used in calculating a retirement or disability benefit, credit shall not be reduced below that certified by the transferring system, except as follows:
(6)
(a) The paying system shall receive from the transferring system or systems all of the following for each year of service: