Today in 1858, one H. L. Lipman was granted a patent for attaching a piece of rubber to the end of a pencil.
Turns out to have been a pretty good idea - but not that good.
Later the courts didn't think it was all that outstanding of an idea.
From Smithsonian:
Unfortunately for Lipman, the patent would later be revoked, when the U.S. Supreme Court rules in 1875 that a pencil with an eraser is just a pencil with an eraser and not a new invention.
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