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Patent US20060086416 - Pencil sharpener - Google Patents

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Patent US6886614 - Pencil sharpener - Google Patents

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Patent EP1650049A2 - Pencil sharpener - Google Patents

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Patent EP2078617B1 - Safety device for an electric pencil sharpener

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Patent US20120233867 - Pencil sharpener with two blades - Google Patents

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West Coast Office Supplies :: Office Supplies :: Writing & Correction

A Guide to Manual and Electric Pencil Sharpeners - Jackson's Art Blog
A Guide to Manual and Electric Pencil Sharpeners - Jackson's Art Blog

Patent US7240703 - Automatic pencil sharpener - Google Patents
Patent US7240703 - Automatic pencil sharpener - Google Patents