labor at which they may be employed, and shall have power to prohibit the employment of any minor that cannot obtain such a certificate. Sec. 3. No person, firm, or corporation shall employ or permit any child under the age of fifteen years to have the care, custody, management of, or to operate any elevator, or shall employ or permit any person under the age of eighteen years to have the care, custody, management, or operation of any elevator running at a speed of over two hundred feet a minute. Sec. 4. It shall be the duty of the owner, agent, or lessee of any manufacturing establishment where there is any elevator, hoisting-shaft, or well-hole, to cause the same to be properly and substantially inclosed or secured, if in the opinion of the Factory Inspector, or of the Assistant Factory Inspector, or a Deputy Factory Inspector, unless disapproved by the Factory Inspector, it is necessary to protect the lives or limbs of those employed in such establishment. It shall also be the duty of the owner, agent, or lessee of each of such establishments to provide or cause to be provided, if, in the opinion of the Inspector, the safety of persons in or about the premises should require it, such proper trap or automatic doors, so fastened in or at all elevator ways as to form a substantial surface when closed, and so constructed as to open and close by action of the elevator in its passage, either ascending or descending, but the requirements of this section shall not apply to passenger elevators that are closed on all sides. The Factory Inspector, Assistant Factory Inspector, and Deputy Factory Inspectors may inspect the cables, gearing, or other apparatus of elevators in manufacturing establishments, and require that the same be kept in a safe condition. Sec. 5. Proper and substantial hand-rails shall be provided on all stairways in manufacturing establishments, and where, in the opinion of the Factory Inspector, or of the Assistant Factory Inspector, or Deputy Factory Inspector, unless disapproved by the Factory Inspector, it is necessary, the steps of said stairs in all such establishments shall be substantially covered with rubber, securely fastened thereon, for the better safety of persons employed in said establishments. The stairs shall be properly screened at the sides and bottom, and all doors leading in or to such factory shall be so constructed as to open outwardly where practicable, and shall be neither locked, bolted, nor fastened during working-hours.