The investigation fever got me! Maybe the story is not new for you,
but I always thought it is a fairytale that after not earning any more
money with electronic drums great inventor Dave Simmons developped a
practice hand for manicure students. But ... it's absolutely true!
Here's the proof:
http://www.simmonsmuseum.com/p/davesimmons.jpg (Dave demonstrating his
invention, taken from a BBC special about synthesizer's history)
http://www.freepatentsonline.com/6488506.html (patent)