This question came up in one of my classes.
So who invented the eraser?
Before the eraser, wax, or even bread, was used to erase pencil marks.
On April 15th 1770 the famous British scientist Joseph Priestley wrote that a vegetable gum, which he called rubber, was very good for erasing black pencil marks. So it is thought that Priestley discovered that rubber is for good for erasing.
But it is later in 1770 that Edward Nairne, a British engineer, first manufactured and sold the rubber eraser. Therefore Nairne is thought to have invented the eraser.