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Early dirigible developments included machine-powered propulsion ( Henri Giffard, 1852 ), rigid frames ( David Schwarz, 1896 ), and improved speed and maneuverability ( Alberto Santos-Dumont, 1901 )

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Early dirigible developments included machine-powered propulsion ( Henri Giffard, 1852 ), rigid frames ( David Schwarz, 1896 ), and improved speed and maneuverability ( Alberto Santos-Dumont, 1901 )

Edit
Promote Demote Fragment Fix

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