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
Football First And Ten Stock Photo - Download Image Now - Distance Marker, First Down - American Football, American Football - Sport - iStock
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Chain crew - Wikipedia
NFL says it has tech to eliminate pylons and first-down markers
206 First Down Marker Images, Stock Photos & Vectors | Shutterstock
Jimmy Kempski on Twitter: "They put a pylon on the first down marker. I don't think I've ever seen that. https://t.co/sINypiHKZj" / Twitter
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File:First down marker.png - Wikimedia Commons
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Live From the 2019 CFP National Championship: First-Down–Marker Cam Upgraded; Yards-to-Gain Pylon Joins PylonCam Family
This might be why Louisville's WR went out of bounds a yard early on a game-deciding play - SBNation.com
FOOTBALL COLLEGIATE SERIES: FBL9064-FBL9106-FBL9109-FBL9066 – California Pro Sports
ESPN Features First-Down Marker Cams For College Football Playoff
The History of Using the Chains to Measure a First Down | NFL Films Presents - YouTube
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1st & Ten (graphics system) - Wikipedia
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Big Ten Network's First Down Marker Was Just A Little Off
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