TECHNOLOGY

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Across
  1. 3. IN 1876, ................. WAS INVENTED.
  2. 4. IN 1590, ................... WAS INVENTED.
  3. 5. IN 1609, ............... WAS INVENTED.
  4. 7. IN 3500 BC, ............ WAS INVENTED.
  5. 8. IN 500 BC, ............ WAS INVENTED.
  6. 11. IN 1903, ................ WAS INVENTED.
  7. 12. IN 1973, ................. WAS INVENTED.
Down
  1. 1. IN 2007, .................. WAS INVENTED.
  2. 2. IN 1939, ................... WAS INVENTED.
  3. 6. IN 1827, ................. WAS INVENTED.
  4. 9. IN 1920S, .................. WAS INVENTED.
  5. 10. IN 1450, .................... WAS INVENTED.