Mechanical Pencil

The mechanical pencil was invented in 1915 by Tokuji Hayakawa (November 3, 1894-June 24, 1980). His first mechanical pencil was called the "Ever-Ready Sharp Pencil." Hayakawa had owned a metalworking shop in Tokyo, Japan, and in 1942, expanded his company and renamed it the Hayakawa Electric Industry Co.,Ltd. It was later called the Sharp Corporation (1970), and Hayakawa was appointed chairman.

Source: http://www.enchantedlearning.com/inventors/1900a.shtml