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Choose the most important invention.
kerosene (paraffin) lamp
 
phonograph
 
plane
 
pencil
space antenna
penicillin
windscreen wiper
Internet
clock
tractor
compass
bulb
toilet
mower
wheel
fridge
cacculator
camera
gunpowder
bulletproof vest
computer
telectroscope
telephone
MP3
walkie-talkie
mine detector
vaccine
television
stean engine
elevator / lift
dishwasher
microwave oven