| 摘要 |
PURPOSE: A necklace-shaped aqua air bag which is convenient to carry and rescues its wearer on neck from being drowned to death by providing buoyancy caused by automatic working of a device producing gas by pressure sense when it reaches at regular depth of water is provided. CONSTITUTION: The necklace-shaped aqua air bag is characterized by being comprised of: a device producing gas(2); a pressure sense(3); an air bag(1); and a hook. Each of these things is comprised of a pair and displayed symmetrically.
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