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The chain gang. In gridiron football, the chain crew (commonly known as the "chain gang") is a crew that manages signal poles on one of the sidelines.There are three primary signal poles: the "rear rod" that marks the beginning of the current set of downs, the "forward rod" that marks the line to gain, and the "box" that marks the line of scrimmage.
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Diagram of a modern American football field. Diagram of an early 20th century version of an American football field. The rectangular field of play used for American football games measures 100 yards (91.44 m) long between the goal lines, and 160 feet (48.8 m) (53.3 yards) wide. The field may be made of grass or artificial turf. In addition ...
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Per the league, a tracking system is installed at every NFL stadium that includes "20-30 ultra-wide band receivers," "2-3 radio-frequency identification (RFID) tags installed into the players ...
The college football standard, which was the previous standard in the NFL (1945–1971), is 40 feet apart, (20 yards from the sidelines) [2] introduced in 1993. [ 3 ] [ 4 ] Previously, the college width was the same as the high school standard (with the exception of Texas, which currently uses the current college width), at one-third of the ...
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