Sec. 901. [=Qualifications of district inspectors of mines.=] No person shall be appointed district inspector of mines unless he has been a resident of the district for which he is appointed, for at least two years, has had at least five years' actual practical experience in mining in this state, has a practical knowledge of the best methods of working and ventilating mines, of the nature and properties of noxious and poisonous gases, particularly fire-damp, of the best means of detecting the presence of and preventing accumulation of such gases and the best means of removing the same, and has a practical knowledge of the uses and dangers of electricity as applied at, in and around mines. Sec. 902. Repealed. (Devoting entire time to duties.) Sec. 903. Repealed. (Bond.) Sec. 904. [=Offices of inspectors.=] The chief inspector of mines shall have an office at the seat of government, in which he shall keep the maps and plans of all mines in the state, and all records, correspondence, papers, apparatus, and other property belonging to the state, pertaining to his office, in accessible and convenient form for reference by persons entitled to examine them, all of which he shall deliver to his successor in office. The persons entitled to examine maps, plans, records and papers of a mine, shall be the owner, lessee or agent of such mine; the persons financially interested in such mine; the owner, or owners, of land adjoining such mine; the owner, or owners, of land adjacent to such mine; the owner, lessee or agent of a mine adjacent to such mine; and the authorized representatives of the employes of such mine. The chief inspector of mines shall not permit such maps, plans, records and papers to be removed from his office, and shall not furnish copies thereof to any persons, except by request of the owner, lessee or agent of the mine to which such maps, plans, records and papers pertain. Each district inspector shall keep his office in such place in his district as is central and convenient. Sec. 905. Repealed. H.B. 249--Sec. 3, 109 O.L.; 105. (Salaries and expenses of inspectors.)