The policemen's civil service commission in each Class I and Class II city shall:
(1) Prescribe and enforce rules and regulations for carrying into effect the civil service provisions of this article. All rules and regulations so prescribed may, from time to time, be added to, amended or rescinded: Provided, That all rules and regulations shall be approved by the mayor and the governing body before they go into effect, but when so approved shall not be changed or rescinded except by the commission with the approval of the mayor and the governing body: Provided, however, That if the mayor and governing body take no action on a proposed rule and regulation or a proposed change or rescission submitted to them within a period of twenty days from the date of submission, then the same shall become effective as though approved by the mayor and governing body.
(2) Keep minutes of its own proceedings, and records of its examinations and other official actions. All recommendations of applicants for office, received by the said commission or by any officer having authority to make appointments to office, shall be kept and preserved for a period of ten years, and all such records, recommendations of former employees excepted, and all written causes of removal, filed with it, shall, subject to reasonable regulation, be open to public inspection.
(3) Make investigations, either sitting as a body or through a single commissioner, concerning all matters touching the enforcement and effect of the civil service provisions of this article and the rules and regulations prescribed hereunder or concerning the action of any examiner or subordinate of the commission or any individual in the public service with respect to the execution of the civil service provisions of this article; and, in the course of such investigations, each commissioner shall have the power to administer oaths and affirmations, and to take testimony.
(4) Have the power to subpoena and require the attendance of witnesses, and the production thereby of books and papers pertinent to the investigations and inquiries herein authorized, and examine them and such public records as it shall require, in relation to any matter which it has the authority to investigate. The fees of such witnesses for attendance and travel shall be the same as for witnesses before the circuit courts of this state, and shall be paid from the appropriation for the incidental expenses of the commission. All officers in the public service, and their deputies, clerks, subordinates and employees shall attend and testify when required to do so by said commission. Any disobedience to, or neglect of, any subpoena issued by the said commissioners, or any one of them, to any person, shall be held a contempt of court, and shall be punished by the circuit court of the county in which the city or the major portion of the territory thereof is located, or the judge thereof in vacation, as if such subpoena had been issued therefrom. The judge of such court shall, upon the application of any one of said commissioners, in any such case, cause the process of said court to issue to compel such person or persons disobeying or neglecting any such subpoena to appear and to give testimony and produce evidence before the said commissioners, or any one of them, and shall have the power to punish any such contempt.
(5) Make an annual report to the mayor showing its own actions, and its rules and regulations, and all of the exceptions thereto in force, and the practical effects thereof, and any suggestions it may have for the more effectual accomplishment of the purposes of the civil service provisions of this article. Such report shall be made available for public inspection within five days after the same shall have been delivered to the mayor of the city.