Okla. Stat. tit. 60, § 60-175.53: Agreements, wills and trust relations to which statute

applicable.

The terms of this act shall apply in the construction of, and

operation under,

A. All agreements containing trust provisions entered into

subsequent to the effective date hereof;

B. All wills made by testators who shall die subsequent to the

effective date hereof; and

C. All other wills and trust agreements and trust relations in

so far as such terms do not impair the obligation of contract or

deprive persons of property without due process of law under the

Constitution of the State of Oklahoma or the United States of

America.