Who is famous for flying propeller-driven hydrogen gas balloons?

The Mongolfier Brothers
Alberto Santos-Dumont
The Wright Brothers
Jean Pierre Blanchard
Alberto Santos-Dumont was a Brazilian inventor and aviation pioneer. In his early career he designed, built, and flew hot air balloons and early dirigibles, culminating in his winning the Deutsch de la Meurthe prize on 19 October 1901 for a flight that rounded the Eiffel Tower.
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The Mongolfier Brothers
Alberto Santos-Dumont
The Wright Brothers
Jean Pierre Blanchard
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