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 Browse Inventions by decade patented: 1920 - 1929 Radio Edwin Howard Armstrong Peanut Products George Washington Carver Ethyl Gasoline Thomas Midgley, Jr. Purified Insulin Charles Best Isolated, Purified Insulin James Collip Isolated, Purified Insulin Frederick Banting Foot Measuring Device Charles F. Brannock Electrocardiograph Willem Einthoven  |
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