Post-It Notes
April 6, 1980, 3M began selling Post-it notes.
Category Inventions
Cotton Gin Patented
March 14, 1794, Eli Whitney received a patent for the cotton gin.
First Electrical System
January 19, 1883, the first electrical system began work at Rosell, New Jersey.
Edison Invents Phonograph
August 12, 1877, Thomas Edison invented the phonograph.