He invented it over 100 years ago
http://www.youtube.com/watch?v=gt8Y93k0pB0
Video about him and how Thomas Edison stole some of his inventions
(may be broke/outdated!)
He invented it over 100 years ago
http://www.youtube.com/watch?v=gt8Y93k0pB0
Video about him and how Thomas Edison stole some of his inventions