Different Types of Pens Since these key breakthrough in pen design, each continues to be modified. As an example, the rollerball was only invented by the 1980s by Japanese company Ohto. The rollerball pen could be the same design since the...
Different Types of Pens Since these key breakthrough in pen design, each continues to be modified. As an example, the rollerball was only invented by the 1980s by Japanese company Ohto. The rollerball pen could be the same design since the...