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.
Billboard (magazine)
The first issue of "Billboard" was published in Cincinnati, Ohio by William Donaldson and James Hennegan on November 1, 1894. Initially, it covered the advertising and bill posting industry, and was known as "Billboard Advertising". At the time, billboards, posters, and paper advertisements placed in public spaces were the primary means of advertising. Donaldson handled editorial and advertising, while Hennegan, who owned Hennegan Printing Co., managed magazine production. The first issues were just eight pages long. The paper had columns like "The Bill Room Gossip" and "The Indefatigable and Tireless Industry of the Bill Poster". A department for agricultural fairs was established in 1896. The title was changed to "The Billboard" in 1897.