Pen noun 1: an implement for writing or drawing with ink or a similar fluid; 2: a writing instrument regarded as a means of expression; 3: the internal horny feather-shaped shell of a squid

Hey, it was a good try

Hyman Lipman was issued a patent in 1858 for attaching an eraser to a pencil. But it was later determined to be invalid, since it was just a combination of two things and didn't provide an adequate new use.

Keep your erasers refrigerated

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