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      Knowledge is Power

      Scientific American September 21, 1889

      Eikonogen-A New Universal Developer for Photographic Dry Plates and Bromide Paper

      • September 21, 1889

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      More in the September 21, 1889 issue of Scientific American
      • An Improved Fruit Picker
      • An Improved Valve Head for Blowing Engines
      • Recently Patented Inventions- September 21, 1893
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