Who first invented mechanical pencil?

19 15, after inventing the belt buckle, a Japanese named Kit Hayakawa invented a metal movable pencil called "Ever-SharpPencil" and obtained a patent in the United States. Hayakawa Kite later founded the electric appliance company, and 1929 was renamed as "Sharp", which is now the Japanese Sharp Company ... The first mechanical pencil, "Hayakawa mechanical pencil" 1973 Sharp Company became the first liquid crystal product in the world. ...