How was the ballpoint pen invented?

After World War II, ballpoint pens were introduced into China. Smart businessmen promote "ballpoint pens" and use the afterglow of the atomic bomb that exploded in Japan not long ago to open up sales. In fact, "ballpoint pen" has nothing to do with atoms, but its pronunciation is similar.

Ballpoint pen is a writing tool that uses the rotation of steel balls to write ink on paper.

A ballpoint pen is different from a fountain pen, because it uses dry and thick ink, which is brought out by the freely rotating steel ball on the pen head and transferred to paper, so it does not leak water, is not affected by the weather, takes a long time to write, and saves the trouble of frequent ink filling. It quickly became popular in the world.