Section 386.320 - General supervision of telegraph and telephone corporations1. The commission shall have the general supervision of all telegraph corporations or telephone corporations, and telegraph and telephone lines, as herein defined, and shall have power to and shall examine the same and keep informed as to their general condition, their capitalization, their franchises and the manner in which their lines and property, owned, leased, controlled or operated are managed, conducted and operated, not only with respect to the adequacy, security and accommodation afforded by their service, but also with respect to their compliance with all the provisions of law, orders and decisions of the commission and charter and franchise requirements.2. The commission shall have power, either through its members or responsible engineers or inspectors or employees duly authorized by it, to enter in and upon and to inspect the property, equipment, buildings, plants, factories, powerhouses, offices, apparatus, machines, devices and lines of any of such corporations or persons.3. The commission and each commissioner shall have power to examine all books, contracts, records, documents and papers of any person or corporation subject to its supervision, and by subpoena duces tecum to compel production thereof. In lieu of requiring production of originals by subpoena duces tecum, the commission or any commissioner may require sworn copies of any such books, records, documents, contracts and papers or parts thereof to be filed with it.Prior revisions: 1929 §§ 5163, 5211; 1919 §§ 10452, 10499