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In 1893, the first football helmet was soft very thin leather on the outer layer, and very thin padding inside the overall helmet. The helmet had very little protection, concussions were common. http://www.extremeteamsports.com/Football-Pop%20Warner/HistoryOfFootballHelmets.htm
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In 1939, John T. Riddell created the hard leather helmet to absorb most of the impact of a hit, it helped reduced the number of concussions In players. http://www.nfl.com/news/story/0ap1000000095139/article/history-of-the-nfl-football-helmet http://www.extremeteamsports.com/Football-Pop%20Warner/HistoryOfFootballHelmets.htm
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In 1955, The single bar facemask was introduced, to avoid the face from getting hit, and the plastic helmet was improved for harder impact and inner padding helped absorb most of the impact. http://www.nfl.com/news/story/0ap1000000095139/article/history-of-the-nfl-football-helmet
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In the 1970s, the energy absorbing helmets had more cushion and padding and absorbed impact, full bar facemask was introduced and every player used it to protect their face. http://www.nfl.com/news/story/0ap1000000095139/article/history-of-the-nfl-football-helmet
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In the 1980s, the molded polycarbonate helmet, had a more impact absorbing shell and extra padding for harder hitting. Reduced Concussions greatly. http://www.nfl.com/news/story/0ap1000000095139/article/history-of-the-nfl-football-helmet http://www.extremeteamsports.com/Football-Pop%20Warner/HistoryOfFootballHelmets.htm
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In the 2000s, Riddell created their new helmet, the Riddell revolution, Shell was made of durable material, extra padding for comfort, and reduce concussions http://www.nfl.com/news/story/0ap1000000095139/article/history-of-the-nfl-football-helmet
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In Present time, companies such as Riddell and Schutt made football helmets, made up of more durable quality: They put extra padding, and inflatable pads in the helmet for extra cushion. http://www.riddell.com/history