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He invented the cotton gin. He may have invented a type of milling machine, but it is hard to say who invented the first one, since several were creating them during that time. Ironically, he didn't make much money off of the cotton gin. There were so many patent violations that his money was all tied up in litigation.

He also popularized the notion of interchangable parts, and he manufactured firearms.

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Q: What 2 things did Eli Whitney invent?
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