Okla. Stat. tit. 62, § 62-57.87: Legal investments

Any bank, trust or insurance company organized under the laws of

Oklahoma may invest its capital, surplus and reserve funds and other

funds under its control in bonds issued under the provisions of this

act. The officers having charge of any fund of the State of

Oklahoma, or any department, agency, or institution thereof or any

sinking fund of any county, city, town, township, board of education

or school district may invest such funds in bonds issued under the

provisions hereof. Such bonds shall also be approved as collateral

security for the deposit of any public funds and for the investment

of trust funds.