The Invention of the Brassiere Hook

This is an invention by the famous novelist Mark Twain. I am linking a well-organized article on the subject.

http://news.hankyung.com/article/2018041981581

[Ko Doo-hyun's Culture Salon] Author Mark Twain's Ingenious Invention
Mark Twain, the author called the "father of modern American literature." He wrote The Adventures of Tom Sawyer, Huckleberry…
news.hankyung.com

In short, he invented the brassiere hook that everyone uses today. From today's perspective it is an essential product and would have been a huge hit, but unfortunately the market had not yet matured, so this is an example where he failed to make money.

Being too far ahead of one's time is no good either. It seems that one must invent at exactly the right timing in order to make money.

Written by Won-Ki Jung, Japanese Patent Attorney