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      Digital & 4-Year Archive

      Scientific American February 20, 1892

      Recently Patented Inventions- February 20, 1892

      • February 20, 1892

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      More in the February 20, 1892 issue of Scientific American
      • A Great Spot on the Sun
      • Belated Inventors
      • New Books and Publications- February 20, 1892
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