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US Patent No. 821,393 was granted to the pioneering brothers, Orville and Wilbur Wright, 110 years ago; and disappeared after being loaned to the Smithsonian Museum by the US National Archives in 1980. Now, all these years later, it has been rediscovered in a limestone cave in Kansas. Original Patent Paperwork The paperwork shows that the Wright brothers were canny as well as inventive: the patent application was filed nine months before their ‘flying machine’ had even been successfully airborne.…