Oof-

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Across
  1. 5. people who make roads
  2. 10. made the paper making machines
  3. 11. they make animal habitats
  4. 12. people who make medicine for animals
  5. 14. made power plants
  6. 15. people who make phones
  7. 18. make railroad components
  8. 19. people who make insulation for houses and buildings
  9. 20. make sure to see if a product has enough quality
Down
  1. 1. makes jet engines
  2. 2. people who made gym equipment
  3. 3. made the Memristor
  4. 4. made a artificial heart
  5. 6. invented concrete
  6. 7. made the X-ray
  7. 8. people who make oil miming machines
  8. 9. people who invented BEAM
  9. 13. people who make tools for doctors
  10. 16. made GMO's
  11. 17. people who make highways