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  1. Dial calipers
  2. USA, New York State, New York City, Span of Brooklyn Bridge
  3. Germany, State Of Hamburg, Hamburg, Construction Cranes, Hafencity
  4. Blueprint Of A Convair B-58 Hustler
  5. Hine: Steelworker, 1931, atop the Empire State Building
  6. Low angle view of an arch, Gateway Arch, St. Louis, Missouri
  7. Low angle view of a pipeline, Trans Alaska Pipeline, Alaska
  8. Rusty Gears And Machine Parts
  9. Queensboro bridge at sunrise
  10. Archive
  11. Suspension bridge across a bay Golden Gate Bridge San Francisco Bay San Francisco California
  12. Sailing down The St. Lawrence River towards Montreal under the Laviolette Bridge
  13. Oscilloscope trace
  14. Silhouette of a bridge at sunset, Bixby Bridge, Big Sur, California,
  15. Heavy double-headed spanner lying on rusty metal sheet
  16. Eighteenth Century Illustration Of A New Machine To Go Without Horses
  17. Bridge in a city, Luxembourg City, Luxembourg
  18. The Brooklyn Bridge in New York City.
  19. Production Line Of B-24 Liberators
  20. Mississippi River Bridge, New Orleans, Louisiana
  21. Interior Of Main Hangar At Fokker Aircraft Corporation
  22. An iron ore cargo ship passes under the Aerial Lift Bridge as it enters Lake Superior
  23. Rusty Gears And Cogs On A Metal Background
  24. Space shuttle docked at the International Space Station
  25. Low angle view of bridges, Tennessee
  26. Suspension bridge across the Ohio River with skyscrapers in the background
  27. Blueprint Of An A-7 Corsair II
  28. Milwaukee Art Museum Milwaukee WI
  29. Blueprint Of A TBF/TBM Avenger Bomber Plane
  30. Milwaukee Art Museum Milwaukee WI
  31. Space shuttle docked at the International Space Station
  32. Low angle view of a tower, Sears Tower, Chicago, Illinois
  33. Bridge across a river, Mississippi River, Natchez, Mississippi
  34. Radio telescope at an observatory, Arecibo Observatory, Arecibo, Puerto Rico
  35. Pile Of Rusty Metal Gears And Machine Parts
  36. Milwaukee Art Museum Milwaukee WI
  37. Milwaukee Art Museum Milwaukee WI
  38. New York
  39. Digital Engine
  40. Milwaukee Art Museum Milwaukee WI
  41. Suspension bridge at dusk Golden Gate Bridge San Francisco California
  42. Thirteen Arch Bridge over the River Funshion, Glanworth, County Cork, Ireland
  43. Close-up of a monument in front of a building, Chicago, Illinois
  44. Low angle view of overpasses, Interstate 105, Los Angeles, California II
  45. Low angle view of a bridge, Clearwater Pass Bridge, Clearwater Beach, Florida
  46. Space shuttle docked at the International Space Station
  47. Milwaukee Art Museum Milwaukee WI
  48. Suspension bridge covered with fog, Golden Gate Bridge