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NFL chain gangs: Everything you need to know about the crews who man the down markers - Sports Illustrated
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An American Football Short Of A First Down Measured With Down Marker Chain Set Stock Photo - Download Image Now - iStock
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NFL chain gangs: Everything you need to know about the crews who man the down markers - Sports Illustrated
Ask Sam Farmer: Why does the NFL use just one set of first-down chains when they have two on the field? - Los Angeles Times
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