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Electric pencil sharpener with a replaceable cutter assembly .
Patent US3678975 - Electric pencil sharpener - Google Patents
ELECTRIC PENCIL SHARPENER WITH A REPLACEABLE CUTTER ASSEMBLY - Patent
Manual and Electric Pencil Sharpeners: A Guide - Jackson's Art Blog
Patent US3134365 - Electric pencil sharpener - Google Patents
West Coast Office Supplies :: Office Supplies :: Writing & Correction
Patent US7699082 - Electric multi-pencil sharpener - Google Patents
Patent EP2078617B1 - Safety device for an electric pencil sharpener