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  1. Oil refining process
  2. NYS trainee working inside the nose cone of a PBY Catalina Navy plane
  3. NYA employees receiving training in the Assembly and Repair Department at Naval Base
  4. James Clerk Maxwell, Scottish Physicist
  5. Bridge In Monet's Garden, 1895-96
  6. George Washington Bridge Approach
  7. Saltash Bridge, c. 1930
  8. Ge Electric Light Bulb
  9. Illustration of geometric shapes
  10. Bridge over canyon in Arizona
  11. Hoover Dam
  12. First Diesel Engine
  13. Testing The Life Of Light Bulbs
  14. TVA's Wheeler Dam Construction, Tennessee
  15. Electrically Heated Ice Cream Scoop
  16. Pont du Gard
  17. Assortment Of Transistors, 1961
  18. Computer network
  19. Mustang at Warton
  20. IBM Electric Typewriter
  21. Camera Patent Buff
  22. Part of a tank
  23. Rifle Carrier for Motorcycle
  24. Overview of Busch Stadium, St. Louis, Missouri
  25. Spooled steel cable
  26. Abstract Motorcycle Wheel
  27. Williamsburg Bridge, view from Brooklyn
  28. Frank Stanton and Prince of Princeton
  29. Aircraft production, Boeing 737 passenger aircraft
  30. Suspension Bridge, Waco, Texas
  31. The ferris wheel at the World's Columbian Exposition of 1893 in Chicago
  32. Electric Tattooing Device, Charles Wagner, 1904
  33. Early Morning at Coniston
  34. 50 Kilowatt Broadcasting Modulator
  35. Type Writing Machine, Patented 1899
  36. The Titanic's propellers in the Thompson Graving Dock of Harland
  37. Eiffel Tower
  38. iPod Patent Blue
  39. Wristwatch Patent Blue
  40. Polaroid Camera Accessory
  41. The Titanic's propellers in the Thompson Graving Dock of Harland
  42. Brooklyn Bridge in Fog
  43. oil pipeline
  44. Dike Site for Floods of The Netherlands
  45. The Titanic's propeller in the Thompson Graving Dock of Harland
  46. Crank It Up
  47. A satellite orbiting above the earth
  48. Crank It Up IV