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Patent EP2078617A1 - Safety device for an electric pencil sharpener
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Small Electric Pencil Sharpener, Black | Bostitch Office
Patent EP2078617B1 - Safety device for an electric pencil sharpener
Pencil Sharpener - Patent application
Electronic Pencil Sharpener - Patent application
Patent US7699082 - Electric multi-pencil sharpener - Google Patents