Written and fact-checked byThe Editors of Encyclopaedia Britannica The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's …查看更多内容
常见问题解答
问:
What American invention, patented in 1794, changed the economy of an entire region, yet it was “so valuable as to be worthless to the inventor”?
答:
After perfecting his cotton gin, Eli Whitney secured a patent (1794), and he and his friend Phineas Miller went into business manufacturing and servicing the new gins...
English
保存
分享
更多