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.
Desk
Refinements to the first desk forms were considerable through the 19th century, as steam-driven machinery made cheap wood-pulp paper possible towards the end of the first phase of the Industrial Revolution. This allowed an increase in the number of the white-collar workers. As these office workers grew in number, desks were mass-produced for them in large quantities, using newer, steam-driven woodworking machinery. This was the first sharp division in desk manufacturing. From then on, limited quantities of finely crafted desks have been continued to be constructed by master cabinetmakers for the homes and offices of the rich, while the vast majority of desks were assembled rapidly by unskilled labor from components turned out in batches by machine tools. Thus, age alone does not guarantee that an antique desk is a masterpiece, since this split in quality took place more than a hundred years ago.