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Mechanism Description: Electric Pencil Sharpener - Wisc-Online OER

Pencil Sharpener - Patent application

Pencil Sharpener - Patent application

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Patent EP2078617A1 - Safety device for an electric pencil sharpener

How to Make An Electric Pencil Sharpener at Home | Automatic Pencil

How to Make An Electric Pencil Sharpener at Home | Automatic Pencil

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Patent US7472728 - Electrically powered rapid sharpening cosmetic

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Patent US7699082 - Electric multi-pencil sharpener - Google Patents