Before revision: By location Argentina 150px|László József Bíró The Inventors' Day () in Argentina has been celebrated since 1986 and is held yearly on 29 September, the birthday of the inventor of the ballpoint pen, László József Bíró.
After revision: By location Irinelson 150px|László József Bíró The Inventors' Day () in Argentina has been celebrated since 1986 and is held yearly on 29 September, the birthday of the inventor of the ballpoint pen, László József Bíró.