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Vannevar Bush invented the differential analyzer that was a computing device that solved differential equations
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Jacob Schick invented the electric razor that made shaving faster and more efficient
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Edward Armstrong invented FM Broadcasting that provided high fidelity sound over the radio.
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Sir Frank Whittle invented the jet engine and began testing in 1937. It gave airplanes the ability to fly at higher speeds in higher altitudes.
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Chester Carlson invented the photocopier which allowed people to make multiple copies of documents.
