[=Duty of coroner.=] Upon receiving notice of a death occurring at a mine, as provided for in this act, the coroner shall hold an inquest forthwith upon the body of such person, inquire carefully into the cause of his death, and within ten days after such inquest, return a copy of his findings, with a description of the body, and all the testimony before him, to the chief inspector of mines. Upon request of the owner, lessee or agent of the mine where such person was employed, shall furnish a copy thereof to such owner, lessee or agent, for which such coroner shall be entitled to a fee of ten cents per legal cap page, but in no case more than five dollars for any one inquest, for copy furnished owner or lessee. (Sec. 940; Penalty, Sec. 976.) =RELATING TO OWNER, LESSEE OR AGENT.= Sec. 922. [=Ventilation of mines.=] The owner, lessee or agent of a mine, shall provide and maintain the necessary artificial means of capacity and power capable of supplying the required ventilation, and shall maintain a sufficient volume of air, not less per minute than one hundred and fifty cubic feet for each person, and five hundred cubic feet for each animal working therein, measured at the intake, and distributed so as to expel or dilute and render harmless, explosive, poisonous and noxious gases. [=Additional requirements where fire-damp is present.=] The owner, lessee or agent of a mine generating fire-damp, so as to be detected by a safety lamp, shall, in addition to the foregoing, provide and maintain not less than fifty cubic feet of air per minute for each person working therein. (Sec. 923, 924, 952; Penalty, Sec. 976.) Sec. 923. [=Ventilating appliances.=] In each mine, the doors used in assisting or directing the ventilation thereof, shall be hung so that they will close themselves, and shall be kept closed except while persons or cars are passing through same. Each door, not operated automatically, through which cars are required to pass, shall have an attendant, whose first duty shall be to open it for transportation, and prevent it from standing open longer than necessary for cars to pass through, and, persons in charge of cars passing through automatic doors shall be required to keep a close watch over such doors, and if any such door fails to close, they shall promptly close same and report such fact to the mine foreman. This shall not prevent the attendant from performing other duties, provided the door is not kept open longer than is necessary for cars to pass through. Where necessary, a refuge place shall be provided at each door for the safety of the attendant. (Sec. 943, 958; Penalty, Sec. 976.)