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Vicis high-tech helmets take top 3 spots in NFL's annual performance ranking of equipment – GeekWire
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New Smart Helmet Could Spot Concussions in Real Time | Columbia Magazine
NFL hopes to reduce head injuries with helmet experiment | Yourbasin
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Guardian Cap: What are and why the NFL asks this safety measure in helmets | Marca
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Xenith Shadow Football Helmet
Riddell's Axiom could be breakthrough helmet for football | AP News
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The Extra Yard: The Ins and Outs of an American Football Helmet - Stories - volumegraphics.com
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