Inventions

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Across
  1. 1. the legendary exclamation of Archimedes
  2. 4. be expert in smth
  3. 6. noun mean technological breakthrough
  4. 7. invenor of Alternating current
Down
  1. 2. inventor of bulb (surname)
  2. 3. first flying tranport
  3. 5. world wide web