What James Watt invented?

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What James Watt invented?

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1) Which insurance salesman invented the fountain pen in 1884?

2) Who is the only U.S. President to invent and patent something?

3) What Galileo invented?

4) What invention is credited to the Russian born American inventor Vladimir Kosma Zworykin?

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

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