WW1 technology

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Across
  1. 4. cannon like guns
  2. 5. you'll need a gas mask
  3. 7. rapid fire guns
  4. 8. sky vehicle
Down
  1. 1. in every car made today
  2. 2. commonly used at hospitals now
  3. 3. a chunkier car
  4. 6. boats but underwater