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Patent US3678975 - Electric pencil sharpener - Google Patents
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ELECTRIC PENCIL SHARPENER WITH A REPLACEABLE CUTTER ASSEMBLY - Patent
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Patent US6886614 - Pencil sharpener - Google Patents
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Patent US7699082 - Electric multi-pencil sharpener - Google Patents
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Patent US3678975 - Electric pencil sharpener - Google Patents
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Manual and Electric Pencil Sharpeners: A Guide - Jackson's Art Blog
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Patent US20070251105 - Electric pencil sharpener - Google Patents