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Patent US3486540 - Electric pencil sharpener - Google Patents

Patent US3486540 - Electric pencil sharpener - Google Patents

Patent US3486540 - Electric pencil sharpener - Google Patents

Patent US3486540 - Electric pencil sharpener - Google Patents

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Patent US3134365 - Electric pencil sharpener - Google Patents

Patent US3134365 - Electric pencil sharpener - Google Patents

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Patent EP2078617B1 - Safety device for an electric pencil sharpener