Okla. Admin. Code § 595:25-1-4
Individual proceedings are governed by 595 O.A.C. §1-3-3. When the applicant, operator, or other interested party is organized as a corporation, a limited liability company, or a partnership, it must be represented by an attorney through all stages of the proceeding. See Massongill v. McDevitt, 1989 OK CIV APP 82, Allen v. City of Chickasha, 2009 OK CIV APP 52, Cf. Rowland v. Calif. Men's Colony, 506 U.S. 194, 202-203 (1993).
Added at 42 Ok Reg, Number 20, effective 7-11-25