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Eli Whitney's love of inventing and pondering new ideas made him one of America's greatest inventors. Best known for inventing the cotton gin, one of the most important American inventions of the century, he changed cotton production forever. A few years later, Whitney invented machines to make muskets that were identical. The first mass-manufacturing business in the country, his musket factory revolutionized the way Americans made things.
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Cyrus McCormick patented and manufactured the reaper, an important 19th century invention that dramatically improved the efficiency of wheat farming. While McCormick did not invent the reaper solely by himself, he did refine and popularize it. His company eventually became the International Harvester Company.
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