Geek Trivia: The Pencil Grading Scale (Which Labels Pencils #1-4) Was Invented By?

1/17/2017 03:52:00 AM HowTo

The Pencil Grading Scale (Which Labels Pencils #1-4) Was Invented By?

Benjamin Franklin
Henry David Thoreau
Mark Twain
Andrew Johnson

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via: howtogeek.com

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