BREATHING MASKS AND HELMETS. by the Belt Helmet and Jacket Combined; the Tube Is Supported to Avoit Dragging Upon the Helmet. of Vulcanized Rubber. Breathing Device for Use Reviving a Victim Overcome by reilleileus Gas by Means of Supplementary Oxygen Supply. Type of Helmets Used in German Passing an Unconscious Miner Through a fleaiing Out Penetrating to the Scene of a Taking a Victim of a Mine Accident to the Surface Strapped Into the Open Air. Disaster in a Coal Mine. Upon a Stretcher. BREATHING MASKS AND HELMETS., scientific american, 1907-02-02
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