Changes in Tech 1920s

5. sends radio waves.
9. invented in Germany. By this women who had insert a hose in the exhaust of a vacuum cleaner.
10. by Engineer Benjamin Holt. He built a crawling tractor which he called the caterpillar. LaPlant-Choate Manufacturing Company had produced this
11. Invented by John A Larson,22 July 1921
12. The old device that played music
13. It can name who is talking just by listening
14. This kept the men's faces looking good without the hard work
19. Fast planes need this

1. Now you can see the tv and believe that its real!
2. invented by Robert Goddard. The North American Space Association still use it today.
3. you can stop your car and watch the movie here!
4. It was patented by John T Thomson
6. You can now watch tv in color
7. Syfy movies would suck without this electronical thing
8. Tvs had color!
15. You wouldn't be listening to Taylor Swift right now without it
16. watch Tells time without having to be winded every time!
17. the device that beeps every minute in a submarine
18. This helped people breath using water pressure
20. Light invented by police officer William Potts. He used red, amber and green lights and $37 worth of wire to make this