WWI Inventions

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Across
  1. 4. Who invented the grenade?
  2. 5. What was the maxim gun?
  3. 6. What did the Wright brothers invent?
  4. 7. Who invented the windshield wiper?
  5. 9. Who invented the first steel plow?
  6. 10. What did James watt improve?
Down
  1. 1. What gas did they use to fly zeppelins?
  2. 2. What did Hiram Maxim invent?
  3. 3. This invention was for cleaning car windshields.
  4. 8. This is a hand throw weapon.