Pencil with eraser was patented in 1858 by Hymen Lipman of Philadelphia, Pennsylvania. He received Patent Number 19,783. About two billion pencils are produced each year. The pencil “lead” is really a form of graphite.
Mar 302024
Pencil with eraser was patented in 1858 by Hymen Lipman of Philadelphia, Pennsylvania. He received Patent Number 19,783. About two billion pencils are produced each year. The pencil “lead” is really a form of graphite.