Who invented the atomic battery in 1912 ?
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Who was the first person to patent the JET ENGINE?
What drink was invented by Charles Leiper Grigg in 1929?
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Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that?
Who invented Telephone?
Who invented fuel cells in 1839?
The first effective vaccine against polio was prepared by ?
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