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  • a brief history of the mechanical pencil - pencils.com

    A Brief History of the Mechanical Pencil - Pencils.com

    Nov 18, 2014 ... Did you know the mechanical pencil has actually existed in one form or another for the ... Blackwing Colors (12 Pack) ... Sharpening Machine ... This is when Joseph Hoffmann invented the pushbutton clutch in New York City.

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