American inventor Eli Whitney was granted a patent for a ground-breaking new type of cotton gin.
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Inventor Richard Rhodes received the patent for a hearing aid.
Hyman Lipman patented the pencil with an eraser on top.
Micah Rugg patented a machine for dressing bolt heads.
The clip-on tie was designed.
John B. Meyenberg from St. Louis, Missouri, patented powdered milk.
