Knowledge of mechanical pencils

English name of mechanical pencil

The mechanical pencil is named after Tokuji Hayakawa, the founder of Sharp Corporation, and is called Mechanical Pencils in English. In the Japan, it is nicknamed such as a mechanical pencil, and is especially popular in the age group before and after the junior high school student.
By the way, in Chinese, the mechanical pencil is called a two-tone Chen-pi.