Mechanical pencils

Mechanical Pencil
A mechanical pencil is a pencil containing solve pencil leads fed up with either a push mechanism or swivel mechanism. The pins typically have a thickness of 0.5 to 0.9 mm and are made of graphite powder mixed with a clay. The more graphite that is in the diocese, the softer it becomes, and vice versa. The first mechanical pencil was invented in 1914 and is usually attributed to American Charles R. Keeran, but the fact is that Japan named Tokuji Hayakawa developed the same technology basically simultaneously.

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