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the first helmet ever used in the nfl was the nfl.
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Later they wanted to decrease the amount of injuries.
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then they wanted to reduce the amount of face injuries so they invented the facemask.
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the plastic helmet made to reduce the skull injuries.
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this was made to improve the designs of the helmets and also to improve the facemask.
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they kept on improving the helmets to reduce the injuries and also the skull injuries.