Walter Hunt patented the safety pin.
Source
Inventor Richard Rhodes received the patent for a hearing aid.
The clarinet was invented in Nuremberg, Germany, by Johann Christoph Denner.
The first sewing machine was patented in the US.
American inventor Theophilus Van Kannel was granted the patent for the revolving door.
Hyman Lipman patented the pencil with an eraser on top.
