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yes he did invent a ballpoint pen.yesYes, he did invent the ballpoint pen.
As far as i can tell the most expensive ballpoint pen in the world is the Mont Blanc ballpoint
A ballpoint is another name for a ballpoint pen or biro, or the device by which it writes.
A biro is a BIRO-brand ballpoint pen, or by extension, any variety of ballpoint pen.
He is Laszlo biros, the inventor of the ballpoint pen, brother. he helped invent the ballpoint pen