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If you are reading this, there is a high probability that you have at least one ballpoint pen in radius of 2 meters form yourself. And who deserves credit for that? László Bíró! (and his brother... and probably some more people...)
George Parker was an American industrialist and inventor. He created the Parker pen brand and Pen Parker Company. Pen Parker Company is one of the largest writing instruments company in the world and the first one that went global.
If you want to thank someone because you don’t have messy fingers and paper when you write with your fountain pen - thank Lewis Edson Waterman who improved a fountain pen and made it a useful tool.