tell me which type of invention you have done what have you done for your parents
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Printing press
Light bulb.
Light bulb.Airplane.
Light bulb.Airplane.Personal computer.
Light bulb.Airplane.Personal computer.Vaccines.
Light bulb.Airplane.Personal computer.Vaccines.Automobile.
Light bulb.Airplane.Personal computer.Vaccines.Automobile.Clock.
Telephone.
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helping toy .. ........
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