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Chain crew
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===On-field measurements=== [[File:1st down measurement at UCLA at Cal 10-25-08.JPG|thumb|left|A first down measurement during a game between the [[USC Trojans football|USC Trojans]] and the [[California Golden Bears football|California Golden Bears]].]] The chains are brought onto the field whenever the referee needs an accurate measurement to determine if a first down has been made. A team may also request an accurate measurement to determine how far they have to reach for the first down.
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