Invention

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Across
  1. 3. A device that convert a audio signal into a sound
  2. 4. A device to take photo and call with
  3. 6. An Output device that produces text and photo on paper
Down
  1. 1. A machine in which food is kept cold to stay fresh
  2. 2. A flying transportation
  3. 3. A ship that travel underwater
  4. 5. A transportation taht runs on track with steep incline