關於oninventions的百科

•   ThomasAlvaEdisonwasawardedmorepatents(專利)oninventions...

• 問題詳情：  ThomasAlvaEdisonwasawardedmorepatents(專利)oninventionsthananotherAmerican.Whenhediedin1931,Americanswonderedhowtheycouldbestshowtheirrespectforhim.Onesuggestionwasthatthenationobserveaminuteortwooftotalblackout.Allelectricpowercouldbeshu...
• 2020-04-1614614