Whiteboard
Whiteboards became commercially available in the early 1960s, but did not become widely used until 30 years later. Early whiteboards needed to be wiped with a damp cloth and markers had a tendency to leave marks behind, even after erasing the board. Dry-erase markers for whiteboards were invented in 1975.
History of Michigan Wolverines football in the Kipke years
In October 1930, Michigan Stadium became the first to use electronic scoreboards. The electronic scoreboards, installed at both ends, were controlled from a switchboard in the press box and displayed the score, downs, yards to go, and other information on a current basis.