U.S. History

In 1910, Thomas Edison was credited with which invention/discovery?

More Questions from U.S. History
What was U.S. President Franklin Roosevelt's private plane called?
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Who wrote the first American Christmas carol?
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Which First Lady was known as "The Duchess"?
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How many U.S. Senators represent each state?
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The Frisbee was invented at what college?
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How long was the "American Taliban" sentenced to prison?
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What did Rose Mary Woods allegedly do?
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The 4th amendment to the U.S. Bill of Rights relates to what?
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