Ohio Rev. Code Ann. § 1555.08
(D) The bond proceedings may contain additional provisions as to:
(I) In the discretion of the commissioners of the sinking fund, obligations may be secured additionally by a trust agreement or indenture between the commissioners and a corporate trustee, which may be any trust company or bank having a place of business within the state. Any such agreement or indenture may contain the resolution authorizing the issuance of the obligations, any provisions that may be contained in any bond proceedings, and other provisions that are customary or appropriate in an agreement or indenture of such type, including, but not limited to:
(O) The commissioners of the sinking fund may covenant in the bond proceedings, and any such covenants control notwithstanding any other provision of law, that the state and applicable officers and governmental agencies of the state, including the general assembly, so long as any obligations are outstanding, shall: