Видео с ютуба Laszlo Biro

Embert tolláról... Bíró László József

Biró, el inventor del bolígrafo, recordado por su hija

A végtelen vonal titka - Bíró László József

The Story of László Bíró: Inventor of the Ballpoint Pen, Reynolds and Papermate

Biro and the Ballpoint Pen

How the biro was invented

Laszlo Biro - Ballpoint Pen and Patent 2390636

Laszlo Biro's story- Past Continuous & Past Simple