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.
List of Oval Office desks
President William Howard Taft constructed the first permanent West Wing to the White House, intending it to be the hub of his administration. Designed by Nathan C. Wyeth and completed in 1909, this wing included the first official Oval Office. On December 24, 1929, during President Herbert Hoover's administration, a fire severely damaged the West Wing. He reconstructed the part of the White House affected, including the Oval Office, reopening them later in his presidency.