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What important things was invented in the 20th century?In: Inventions |
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http://www.historylearningsite.co.uk/inventions_1900_to_1990.htm
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Important people that invented things? Things that was invented thats important? What things were invented in the 20th century? What was invented in the 20th century in america? 10 most important things that have ever been invented?
