Usage
All levels of football are believed to currently use the chain crew, with the exception of the unorganized levels of the game such as backyard, touch and flag football, which use their own ad hoc solutions that do not require a manned chain crew.
One notable exception at the professional level was the World Football League of 1974 to 1975, which used a proprietary device called the "dicker-rod," a 90-inch stick that allowed measurements to be made with one person instead of three. The dicker-rod never saw any usage outside the WFL.
Read more about this topic: Chain Crew
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