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Who Invented Pencil Sharpener
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The credit of inventing pencil sharpener goes to a french mathematician in 1828. It is believed that this person was Bernard Lassimone but there is debate on this name. Following his invention, other designers made improvements and refinements which includes Therry des Estwaux (also from france) who invented the first mechanical pencil sharpener in 1847. In 1855, the first American pencil sharpener was patented by Walter K. Foster.
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