Which Hungary-born inventor patented the first commercially successful modern ballpoint pen?
Answer and explanation
Correct answer: A. László Bíró
- Step 1: László Bíró, a Hungarian-born inventor who later lived in Argentina, patented the first commercially successful ballpoint pen. Answer: László Bíró. Why not the others: Ernő Rubik, Ányos Jedlik and Tivadar Puskás don't fit.
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