Mechanical pencil history notes that in 1913 Charles R. Keeran invented the Eversharp Pencil, the first mass-produced mechanical pencil to combine a simple propelling mechanism with large lead capacity and robust, ergonomically sound design. The Eversharp Pencil built on the history of lead pencil and came to be used synonymously with “mechanical pencil”. There is some confusion in pencil history about who actually invented the mechanical pencil. Hayakawa Tokuji invented the Ever-Ready Sharp pencil in Japan, according to the history of pencils. The Ever-Ready Sharp Pencil was first produced in the United States in 1915. In the history of pencils, Hayakawa Tokuji gets the credit for the invention of the mechanical pencil, but the Eversharp Pencil went to market first.

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