(2) The commission shall have a seal with the words "Public Utility Commission of Oregon" and such other design as the commission may prescribe engraved thereon, by which the proceedings of the commission shall be authenticated and of which the courts shall take judicial notice.
(3) Any investigation, inquiry or hearing which the commission has power to undertake or to hold may be undertaken or held by or before any commissioner designated by order of the commission. Except as provided in ORS 756.055, all investigations, inquiries and hearings so held shall be conducted as though by the full commission with such commissioner empowered to exercise all the powers of the commission with respect thereto. [1985 c.834 §§3,4,5]