What Igor Sikorsky invented?
Hydroplane
Jet engine airplane
Helicopter
Glider
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What Henry Bessemer invented? |
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What invention was first installed at a Hartford, Connecticut bank in 1889? |
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Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that? |
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Who invented Bifocal Lens? |
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What Karl Benz invented? |
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When were bar code scanners invented? |
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When was the game Frisbee invented? |
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This English inventor is known as the Father of Computing. |
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Who invented Airship (rigid)? |
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What piece of clothing was invented by French fashion designer Louis Reard in 1946? |
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