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.
Western use of the swastika in the early 20th century
"Swastika Boards" were built using laminated redwood and balsa wood by legendary surfer Lorrin "Whitey" Harrison in Los Angeles from 1931 until 1939 when they were renamed "Waikiki Surfboards" "Swastikas became the most widely used production solid board of the period leading into World War II."