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REPLY: I think (and that's not always a good thing) that the arm bands on the H and L were used to signify which official (one per sideline) were to be used when an incoming substitute entered the game. Yes...at one time, all incoming subs needed to report to an official. If you look at the current Fed rule book, there is even a vestige of that old rule remaining. Look at the definition of 'substitute.' Wouldn't be at all surprised if that criteria of "...communicates with an official" is left over from that old rule.
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Bob M.
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