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  1. Construction of San Francisco Bay Bridge
  2. Pylons in a rural landscape at dusk
  3. Salmon Leap Weir, Athlone, County Roscommon, Ireland
  4. Bridge across a bay at sunset Chesapeake Bay Bridge Chesapeake Bay Maryland
  5. Crank It Up III
  6. Bicycle Patent II Buff
  7. Drawing Showing Uses and Intricates of Early Elevator
  8. Scooter Patent II Buff
  9. 8x10 Century Universal Camera, 1929
  10. Bay Bridge, San Francisco Bay, San Francisco, California, 2010
  11. Walkman Patent Blue
  12. Eads Bridge, St. Louis, Missouri
  13. Placing the Last Link
  14. Flying Machine II Buff
  15. Flying Machine I Blue
  16. Gee Bee
  17. Summer Homework
  18. Movie Projector III Buff
  19. Hoover Dam NV
  20. Movie Projector I Buff
  21. F4U Corsair
  22. Pedestrians and Vehicles Crossing Bridge, London, England
  23. Khaju Bridge is one of the most famous and beautiful bridges in Esfahan.
  24. Eiffel tower, Paris.
  25. Bicycle Patent III Blue
  26. C-47 Skytrain
  27. Detail Bay Bridge
  28. Turbine Room of Wilson Dam Power Plant, Alabama
  29. Bridge across an inlet Puget Sound Seattle Washington State
  30. Cincinnati, Ohio skyline and Ohio River
  31. Flying Machine I Buff
  32. Crank It Up II
  33. Marconi's Wireless Telegraph
  34. Drawing of flying machine
  35. Interior Of A Regrinding Plant
  36. Flying Machine II Blue
  37. Bicycle Patent III Buff
  38. Bicycle Patent I Blue
  39. Seismograph, an instrument for measuring and recording the vibrations of earthquakes
  40. Low angle view of a bridge, Marco Island, Florida
  41. Bicycle Patent II Blue
  42. Detail Bay Bridge
  43. Scooter Patent I Blue
  44. The Claudian Aqueduct, Rome, 1785
  45. Workmen in Tunnel, 6th Avenue subway, New York
  46. Ohio, Columbus, Big Walnut Creek, Low angle view of a Dam
  47. Diagram of the machinery for the construction of the Brooklyn Bridge, 1880
  48. A Study With Free Fall