Okla. Stat. tit. 60, § 396

The duties hereby imposed upon any such trustees shall be in addition to the duties otherwise imposed by law upon each of them as a public officer, and, in all instances where the value of the property involved in such a gift shall equal or exceed Five Hundred Thousand Dollars ($500,000.00), each of such trustees shall be entitled to receive from such trust estate the sum of Two Hundred Dollars ($200.00) per month while acting as such trustee, including the time he remains as such public official. Laws 1953, p. 293, § 16.