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Inventions

Inventions
In which decade were the first successful diode and triode vacuum tubes invented?

1890s
1800s
1880s
1900s

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Inventions
What Elisha Otis invented?

The brake used in modern elevators
Turbine
Hydraulic Crane
Jet Engine

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Inventions
In which decade was the first solid state integrated circuit demonstrated?

1960s
1980s
1950s
1970s

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Inventions
What invention was first installed at a Hartford, Connecticut bank in 1889?

Pay telephone
Time-lock safe
Automatic teller machine
Burglar alarm

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Inventions
What 'game' was first produced by the Southern Novelty Company in Baltimore, Maryland in 1892?

Ping Pong
Frisbee
Monopoly
Ouija board

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Inventions
Which of the following was first patented by an Australian in 1889?

Electric Drill
Electric Shaver
Electric Heater
Electric Fence

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