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  1. 7. eli whitney's most famous invention
  2. 9. made plowing the dirt easier
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  1. 1. Invented by James Hargreaves In 1764
  2. 2. invented by samuel morse
  3. 3. eli whitney's first invention
  4. 4. Invented by Cyrus McCormick in 1847
  5. 5. the steel bars the train rides on
  6. 6. big boat powered by heated water
  7. 8. made by Elias Howe in 1846