Okla. Stat. tit. 12, § 620
In all actions referred to a referee by the district or superior court, with directions to make findings of fact and conclusions of law and to report the evidence to the court, the referee must file a written report of his findings of fact and conclusions of law and the transcript of the testimony with the clerk of the court.
Laws 1941, HB 228, p. 35, § 1, emerg. eff. April 25, 1941.