when did football start using helmets
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when did football start using helmets
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who created the first football helmet
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when did football start using helmets, when did the nfl start using helmets, when did the nfl start wearing helmets, when was the first football helmet made, first helmet in football history, football helmet history timeline, who created the first football helmet, who invented the first football helmet, first ever football helmet, american football helmet history, nfl football helmet history, history of nfl helmets