Landstrom invented
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Between small and large human intestine which one is longer?
Bushwell invented
What invention caused many deaths while testing it?
What plaything was invented by Joe McVicker in 1956?
Which insurance salesman invented the fountain pen in 1884?
Lewis Edson Waterman patented the first practical fountain pen in 1884.
Twice the difference between two numbers is equal to their sum. If one number is 15,find the other number.
Who is often called the 'first African-American' inventor?