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.
NOMA (company)
When the NOMA Electric Company was located in New York City, it may have produced the first commercial printed circuit board in 1946 with its Party Quiz Game. It was an electrical board game with replaceable question cards and two electrodes which, when placed in the proper positions to answer a question correctly, cause a bulb to light. Initially hard-wired, the game was made thinner by hot pressing aluminum foil onto cardboard, with the electrical contacts made into the board.