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Pre-Algebra 20 Online
OpenStudy (andrejrusa123):

When Congress refused to renew the patent, which expired in 1807, Whitney concluded that 'an invention can be so valuable as to be worthless to the inventor.' He never patented his later inventions, one of which was a milling machine. His genius as expressed in tools, machines, and technological ideas made the southern United States dominant in cotton production and the northern states a bastion of industry.

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