Who was the first person to patent the JET ENGINE?
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What furniture item was invented by California furniture designer Charles Prior Hall in 1968?
Who invented the BALLPOINT PEN?
FROZEN FOOD – Who discovered the first practical method of freezing food?
Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that?
Who invented fuel cells in 1839?
k purchased a table for Rs.11,000 and sold it for Rs.13,500.what is his gain in percentage?
The first effective vaccine against polio was prepared by ?
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