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Impact test comparisons of 20th and 21st century American football helmets in: Journal of Neurosurgery Volume 116 Issue 1 (2012) Journals
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/cdn.vox-cdn.com/uploads/chorus_asset/file/18965394/904352610.jpg.jpg "Everything you need to know about the NFL's helmet guidelines and restrictions - Canal Street Chronicles")
Everything you need to know about the NFL's helmet guidelines and restrictions - Canal Street Chronicles
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Lot Detail - 1993-94 RONNIE LOTT NEW YORK JETS GAME WORN HELMET (NSM COLLECTION)
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Pegasus Sports unisex Hover Helmet, Team Color, One Size US
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Rolesville football coach Helms relieved of duties
