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.
Steve Ritchie
Ritchie moved to Chicago, Illinois, the home of Williams' headquarters. His first game for the company, "Flash" (released in 1979), was noted for its revolutionary figure-8 design and the first pinball game to feature bright Flash Lamps. It would go on to be his best-selling pinball game, having sold 19,505 units. 1980 would be the year for Ritchie, when he designed "Firepower" (the first electronic pinball to feature multi-ball, as well as Lane Change), and eight months later, he designed "Black Knight", which was noted for having the first two-level playfield and the patented "Magna-Save" feature (in which magnets help prevent outlane drains).