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Patent US20070251105 - Electric pencil sharpener - Google Patents
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Patent EP2078617B1 - Safety device for an electric pencil sharpener
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Patent US8205649 - Cutter assembly and electric pencil sharpener
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Patent EP2078617B1 - Safety device for an electric pencil sharpener
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A Guide to Manual and Electric Pencil Sharpeners - Jackson's Art Blog