In 1994, the NFL instituted the use of a radio helmet to allow for limited communication from the sidelines to the quarterback on the field. While it might seem that such a technological advancement was a first, the idea was actually nearly 40 years old.
According to the
Pro Football Hall of Fame
: "In 1955. G.E. Morgan (a consultant to Riddell, and Paul Brown the coach of the Cleveland Browns) invented the BT-5 face mask which is the single bar design. The year after the BT-5 a single wave radio was installed in a player's helmet so the coach could give the play to the quarterback over a radio frequency. It only resulted in game-time interference but the experiment was ahead of it's time."