Ohio Rev. Code § 2729.02: Commissioner to take testimony - rules.

To enable the probate court to make restoration of lost or destroyed records as provided in section 2729.01 of the Revised Code, the probate judge may make such rules and regulations governing the proceedings for taking testimony and ascertaining the facts with reference to their restoration as he deems necessary.

If such records are lost by fire, riot, or civil commotion, such judge may appoint a commissioner to take testimony and report it with his findings thereon, in matters of their restoration. All such evidence shall be taken before such commissioner unless, upon the application of the parties, a reference is ordered to a special master commissioner, in which case the costs of reference shall be paid by the parties.