Alphabet Engineering

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Across
  1. 4. oil extracting devices
  2. 7. railway systems
  3. 8. airplane
  4. 9. submarines
  5. 11. truth detectors
  6. 13. lawnmower
  7. 16. heating
  8. 17. earthquake safety buildings
  9. 19. resources dams
  10. 21. air conditioning
  11. 25. yeast used to prevent cancer
  12. 26. hard drives
Down
  1. 1. prototypes
  2. 2. x-rays
  3. 3. building foundations
  4. 5. ultrasounds
  5. 6. navy ships
  6. 10. windmill
  7. 12. light bulbs
  8. 14. pool filters that get rid of all harmful bacteria
  9. 15. cars
  10. 18. railroads
  11. 20. lumber equipment
  12. 22. underwater cell phone lines
  13. 23. software that runs apps on phones
  14. 24. Gravity zero gravity effect machines