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Future of football safety could come down to research in Riddell's suburban Chicago office - Chicago Tribune
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![10: The Riddell Revolution helmet (left) compared to the early VSR4... | Download Scientific Diagram 10: The Riddell Revolution helmet (left) compared to the early VSR4... | Download Scientific Diagram](https://www.researchgate.net/profile/Eric-Blackman/publication/258219381/figure/fig8/AS:297342902259721@1447903480533/The-Riddell-Revolution-helmet-left-compared-to-the-early-VSR4-type-design-Note-the.png)