Down (gridiron football) - Wikipedia
Unchained: Ref breaks chain off of down marker - ESPN Video
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
1st & Ten (graphics system) - Wikipedia
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Why the NFL Still Uses Chains to Measure First Downs
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The Davone Bess Film Room Part 2: "First Down Machine!" - Dawgs By Nature
Why the NFL Still Uses Chains to Measure First Downs
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Super Bowl LIV: How NFL Measures First Downs Is Primitively Low-Tech
Why Does the NFL Still Use Chains to Measure First Downs?
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Football Down Marker and Chains
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