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in the 20s football helmet were not excepted in college or NFL
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In 1939 the first plastic helmet patented
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in 1949 plastic helmet were officially adopted by the NFL
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1955 the single bar was added to face mask
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by 1962 every player in the NFL was required to have a face mask
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in 1971 air bladders were add inside the helmet to soften the impact
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1984 first protective visors appear
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