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Unchained? Technology exists if the NFL wants to measure first downs with precision | Broncos preview | Sports | gazette.com
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Oct 9, 2011; San Francisco, CA, USA; NFL linesmen set the first down marker on the sidelines during the first quarter between the San Francisco 49ers and the Tampa Bay Buccaneers at
Super Bowl LIV: How NFL Measures First Downs Is Primitively Low-Tech
Why the NFL Still Uses Chains to Measure First Downs
Why Does the NFL Still Use Chains to Measure First Downs?
