The person who thought of putting an eraser on a pencil was
Joseph Rechendorfes of New York. Back in the 1850s pencils and erasers had been invented, but they weren't fastened together. If you made a mistake with a pencil, you had to find as eraser, In 1858, rechendorfer took out a patent on his idea. His pencils become very popular, Pencil eraser are made of rubber mixed with pumice for erasing power, they crumble gradually when used. An eraser that does not crumble smears the marks without moving them completely.
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