The ans is -
George Washington Ferris
In 1856, who invented the process whereby 5 tons of steel could be made in 30 minutes instead of in 50lb batches over 10 days and nights, at a tenth of the cost?
Who or what were the first living creatures sent up to test the hot air balloon invented and first flown (unmanned) by the Montgolfier brothers in France earlier in 1783?
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