When were AAAA invented?

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  1. #hubert
  2. #produced
  3. #mostly
  4. #detectors
  5. #conrad
  6. #first
  7. #electric
  8. #torch
  9. #brass
  10. #founder
  11. #battery
  12. #company
  13. #smoke
  14. #putting
  15. #flashlight
  16. #rough
  17. #invented
  18. #inside
  19. #reflector
  20. #eveready
  21. #together
  22. #paper