Invention Grant
US08118071B2 Pencil sharpener 失效
卷笔刀

Pencil sharpener
Abstract:
A pencil sharpener that facilitates the sharpening of pencils by any one or more of the following: preventing injury; automatically sharpening pencils without manual manipulation; providing status indicators during sharpening; and/or allowing varying degrees of sharpness to be selected.
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