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> Vortex gun fires charged gas rings at 90 mph |  |
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Vortex gun fires charged gas rings at 90 mph |
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MSNBC - Technology
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03/01/2012 at 23:55:08 |
 Vortex guns capable of firing doughnut-shaped rings of air have sat around as toys or oddball gadgets for years. Now a U.S. lab has added an extra kick with electrically charged rings that could clear out smoke-filled hallways for firefighters, or deliver clingy shots of tear gas or pepper spray without the need for accuracy.
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