Okla. Stat. tit. 17, § 41

Cotton gins maintained and operated for the purpose of ginning seed cotton of the general public, or of persons other than the person or persons, or the stockholders of the corporation maintaining and operating said gin, or maintained and operated for the purpose of ginning seed cotton not produced and owned by the person or persons, or the stockholders of the corporation, maintaining and operating said gin, are hereby declared to be public utilities, and the operation of same for the purpose of ginning seed cotton is declared to be a public business. Laws 1915, c. 176, § 1; Laws 1929, c. 240, p. 301, § 1.