Okla. Stat. tit. 62, § 62-13: Duties of Bond Commissioner - Certificate - Bonds

incontestable after 30 days.

It shall be the duty of the Bond Commissioner to prepare uniform

forms and prescribe a method of procedure under the laws of the

state in all cases where it is desired to issue public securities or

bonds, in any county, township, municipality or political or other

subdivisions thereof of the State of Oklahoma; and it shall be the

further duty of said Bond Commissioner to examine into and pass upon

any security so issued, and such security, when declared by the

certificate of said Bond Commissioner to be issued in accordance

with the forms of procedure so provided shall be incontestable in

any court in the State of Oklahoma unless suit thereon shall be

brought in a court having jurisdiction of the same within thirty

(30) days from the date of the approval thereof by the Bond

Commissioner.