Who invented machine tools?

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  2. #firearms
  3. #built
  4. #universal
  5. #simeon
  6. #milling
  7. #whitney
  8. #first
  9. #fully
  10. #states
  11. #flutes
  12. #brown
  13. #helical
  14. #north
  15. #drills
  16. #these
  17. #notable
  18. #machine
  19. #among
  20. #manufacture
  21. #united
  22. #invented
  23. #twist