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NFL at 100: Helmets go high tech in quest for player safety – Macomb Daily
NFL at 100: Helmets go high tech in quest for player safety
NFL, NFLPA release results of annual helmet testing: Three previously approved models now prohibited
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The 2018 Vicis Zero1 Wins Top Honors in NFL and NFLPA Testing
NFL at 100: Helmets go high tech in quest for player safety
VICIS Zero1 top testing helmet NFL
NFL Enters Next Era Of Helmet Safety With Advent Of Quarterback-Specific Helmet