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  1. Printed circuit board, computer artwork
  2. Tangled
  3. Electronic simulator, 1954
  4. Close Up View of a Gate, Temple of Heaven, Beijing, China
  5. Rear face of Big Ben in the clock tower of Parliament, London, England, UK
  6. Wrought iron New Orleans LA
  7. DEC PDP-1 computer
  8. Florence Door Knocker I
  9. Microprocessor chips
  10. Lamps and lanterns in shop in the Grand Bazaar, Istanbul, Turkey
  11. Air Show Andrews I
  12. Computer memory chips
  13. Computer hard disc
  14. SCSI card
  15. Weathered Door II
  16. Leave Window
  17. Rivets
  18. Blue painted door and knocker in the centre of the city of Dublin, Eire, Europe
  19. The Wave
  20. Key to the Door
  21. Titanic (1997)
  22. On Higher Level
  23. Italy, Latium, Rome, Aventine Hill, View of St.Peter's Basilica
  24. Pull To Open
  25. Trading Center on Astor Place, New York City
  26. Close-up of combination lock
  27. Heavy chain links, Seville, Spain