Inventions

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1.
Wheel
2.
Printing
3.
Compass
4.
Gunpowder
5.
Paper
6.
Telescope
7.
Microscope
8.
Steamengine
9.
Telephone
10.
Lightbulb
11.
Radio
12.
Airplane
13.
Automobile
14.
Computer
15.
Internet
16.
Penicillin
17.
Vaccine
18.
Xray
19.
Radar
20.
Laser
21.
Transistor
22.
Battery
23.
Refrigerator
24.
Microwave
25.
Television
26.
Camera
27.
Phonograph
28.
Motionpicture
29.
Assemblyline
30.
Tractor
31.
Combine
32.
Fertilizer
33.
Pesticide
34.
Irrigation
35.
Dynamo
36.
Motor
37.
Transformer
38.
Relay
39.
Switch
40.
Circuit