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  1. Telephone operators working on an international switchboard in the 1930s
  2. Vinyl record
  3. Wooden Abacus
  4. The SpaceX Dragon commercial cargo craft
  5. Interiors of a museum Museum of Flight Seattle Washington State
  6. Antique brass scales
  7. Space shuttle Endeavour backdropped by a colorful Earth
  8. IBM Electric Typewriter
  9. The final launch of Space Shuttle Atlantis
  10. generator
  11. Cold War medical training, 1958
  12. Mixer
  13. Eiffel Tower: Construction
  14. Speedometer on vintage car
  15. Early General Electric Washing Machine
  16. Arrows
  17. Concentrating Solar Power Plant
  18. Door of safe, Close-up of handle and dial
  19. Circuit Board
  20. old-fashioned scope
  21. Hi-end loudspeaker.
  22. Carpentry Tools
  23. United Kingdom, Bristol, close up of printing plate
  24. Close up of printing blocks with dollar sign
  25. Finger pressing telegraph key, studio shot
  26. Early Washing Machine
  27. Parkes radio telescope at night, Parkes, NSW, Australia.
  28. A carpenter using a block plane, shavings on the table
  29. Worker examining empty airplane
  30. Various diodes