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Show Automatic Oxygen Masks Unlike all other oxygen masks which must be regulated by the wearer, the latest type, now being be-ing made for United States military mili-tary airmen, works automatically and eliminates a great deal of worry and guesswork, says Collier's. Col-lier's. ' At all altitudes up to 38,000 feet, it supplies the flier with the proper mixture of air and oxygen, the flow of both being regulated by valves which, in turn, are controlled con-trolled by atmospheric pressure. |