من هو الرئيس الأمريكي الذي سجلت بإسمه براءة بعض الإختراعات ؟
Abraham Lincoln's patent relates to an invention to lift boats over shoals and obstructions in a river. It is the only United States patent ever registered to a President of the United States. Lincoln conceived the idea of inventing a mechanism that would lift a boat over shoals and obstructions when on two different occasions the boat on which he traveled got hung up on obstructions. The original documentation of this patent was rediscovered in 1997.
Abraham Lincoln