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- John T. Riddell company patented first plastic helmet
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- Invention of first chin strap
- NFL requires all players to wear helmets
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- Single face bar was added to plastic helmets
- First appearance of radio helmets
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- Facemasks were worn by every NFL player
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- Ridden adds air bladders inside helmets to soften impact
- First appearance of full face mask
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- First appearance of protective visors
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- NFL requires face masks to be transparent
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- Single bar helmet banned by NFL
- Helmet created to reduce concussions
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- Impact indicator chin straps launch, designed to identify head injury