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ThomasAlvaEdisonwasawardedmorepatents(專利)oninventions...
問題詳情: ThomasAlvaEdisonwasawardedmorepatents(專利)oninventionsthananotherAmerican.Whenhediedin1931,Americanswonderedhowtheycouldbestshowtheirrespectforhim.Onesuggestionwasthatthenationobserveamin...