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Slavoljub Eduard Penkala, Croatian engineer, invented the mechanical pencil (born 1871)
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Slavoljub Eduard Penkala
Croatian engineer and inventor
Slavoljub Eduard Penkala was a Croatian engineer and inventor.Source: Wikipedia (CC BY-SA)
Mechanical pencil
Pencil with a replaceable and mechanically extendable solid pigment core
A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead". The lead, often made of graphite, is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use.…Source: Wikipedia (CC BY-SA)