Chapter 9. Rates, Examinations, Investigations, and Hearings. § 34–901. Existing rates continued; schedules to be filed; application to change rates; review of ruling by Court of Appeals. § 34–902. Commission may adopt rules and regulations. § 34–903. Commission to keep informed of business conduct of utilities. § 34–904. Inspection of books and examination of officers of utilities. § 34–905. Production of records of utilities; attendance of witnesses; duties of United States Attorney and D.C. Attorney General. § 34–906. Appointment of investigating agents; powers. § 34–907. Utilities to furnish information required by Commission; maps, books, reports to be delivered on request. § 34–908. Investigation of unjust discriminatory rates, schedules, or services; no order to be entered without formal hearing. § 34–909. Public notice of rate applications or changes in conditions of service; opportunity for public response; notice to utility; setting time and place for hearing and investigation. § 34–910. Notice as to hearings; compulsory attendance of witnesses. § 34–911. Reasonable rates to be ordered; notice to affected utility. § 34–912. Expenses of investigation to be borne by utility; deposit for costs; limitation of expenditures in hearings; reimbursement fee. § 34–913. Separate hearings on complaints; complaints not to be dismissed because of absence of direct damage. § 34–914. Summary investigation. § 34–915. Hearings after summary investigation. § 34–916. Notice; hearing to be conducted as though complaint had been filed. § 34–917. Utility may make complaint. § 34–918. Commissioners and agents may administer oaths, issue subpoenas; proceeding to punish for contempt. § 34–919. Witness fees. § 34–920. Testimony may be taken by deposition. § 34–921. Record of proceedings to be kept; testimony to be taken stenographically. § 34–922. Certified copy of transcript to be received in evidence; copy to be furnished without cost.