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What did Abraham Lincoln invent?

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  • "Abraham Lincoln's Patent." Abraham Lincoln Online. 2010. (Dec. 29, 2010)http://showcase.netins.net/web/creative/lincoln/education/patent.htm
  • United States Patent and Trademark Office. "Patent Number: US000006469." (Jan. 3, 2011)http://patimg1.uspto.gov/.piw?docid=00006469&SectionNum=2&IDKey=935315B8EF51&HomeUrl=http://pimg-piw.uspto.gov/

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