What is the origin of ballpoint pen?

In the early days of World War II, when reporters interviewed in the battlefield, fountain pens were often unable to write because they had no ink.

At that time, the quality of pencils was still unstable and could not stand friction. Journalists often worry that the writing tools are not satisfactory.

Hungarian journalist Lez Bilo made the prototype of the first ballpoint pen with oil-soluble pigments according to the principle of oil penetration, which is called "oil-soluble pen", which is now called "ballpoint pen".

At that time, Hungary had joined the Axis League under the threat of German fascism. Biro, who has a sense of justice, applied for a patent in Britain and then sold it to Iverson in the United States.